Palindrome vs Level of Palindrome
$begingroup$
The palindrome, example: $131$, $82728$, $55655$.
But from the palindrome maker algorithm
say:
If $17$ isn't palindrome you must additive by reverse of them
$33$ is say $P(1)$ palindrome
$38$ is say $P(2)$ semipalindrome of level $1$
Because:
$38+83=121$
$182$ is say $P(5)$ semipalindrome of level $4$
Because:
$182+281=463$
$463+364=827$
$827+728=1555$
$1555+5551=6666$
So the question is:
How many semipalindrome of level $1$ between $1-1000$ are?
number-theory palindrome
$endgroup$
add a comment |
$begingroup$
The palindrome, example: $131$, $82728$, $55655$.
But from the palindrome maker algorithm
say:
If $17$ isn't palindrome you must additive by reverse of them
$33$ is say $P(1)$ palindrome
$38$ is say $P(2)$ semipalindrome of level $1$
Because:
$38+83=121$
$182$ is say $P(5)$ semipalindrome of level $4$
Because:
$182+281=463$
$463+364=827$
$827+728=1555$
$1555+5551=6666$
So the question is:
How many semipalindrome of level $1$ between $1-1000$ are?
number-theory palindrome
$endgroup$
$begingroup$
Well, if there are no carries involved in the addition then you always get a palindrome on one iteration, as in $134+431=565$. That gives you a lot of them, but not all (as your $38+83$ example shows). I wouldn't think it would be too hard to count those examples as well...after all they must begin and end in $1$ after the sum.
$endgroup$
– lulu
Dec 30 '18 at 15:01
$begingroup$
Is $2$ a semipalindrome because $2+2=4$ and $4$ is a palindrome? How about $22$?
$endgroup$
– Ross Millikan
Dec 30 '18 at 15:41
add a comment |
$begingroup$
The palindrome, example: $131$, $82728$, $55655$.
But from the palindrome maker algorithm
say:
If $17$ isn't palindrome you must additive by reverse of them
$33$ is say $P(1)$ palindrome
$38$ is say $P(2)$ semipalindrome of level $1$
Because:
$38+83=121$
$182$ is say $P(5)$ semipalindrome of level $4$
Because:
$182+281=463$
$463+364=827$
$827+728=1555$
$1555+5551=6666$
So the question is:
How many semipalindrome of level $1$ between $1-1000$ are?
number-theory palindrome
$endgroup$
The palindrome, example: $131$, $82728$, $55655$.
But from the palindrome maker algorithm
say:
If $17$ isn't palindrome you must additive by reverse of them
$33$ is say $P(1)$ palindrome
$38$ is say $P(2)$ semipalindrome of level $1$
Because:
$38+83=121$
$182$ is say $P(5)$ semipalindrome of level $4$
Because:
$182+281=463$
$463+364=827$
$827+728=1555$
$1555+5551=6666$
So the question is:
How many semipalindrome of level $1$ between $1-1000$ are?
number-theory palindrome
number-theory palindrome
edited Dec 30 '18 at 15:13
Zacky
7,89511061
7,89511061
asked Dec 30 '18 at 14:52
HeartHeart
30519
30519
$begingroup$
Well, if there are no carries involved in the addition then you always get a palindrome on one iteration, as in $134+431=565$. That gives you a lot of them, but not all (as your $38+83$ example shows). I wouldn't think it would be too hard to count those examples as well...after all they must begin and end in $1$ after the sum.
$endgroup$
– lulu
Dec 30 '18 at 15:01
$begingroup$
Is $2$ a semipalindrome because $2+2=4$ and $4$ is a palindrome? How about $22$?
$endgroup$
– Ross Millikan
Dec 30 '18 at 15:41
add a comment |
$begingroup$
Well, if there are no carries involved in the addition then you always get a palindrome on one iteration, as in $134+431=565$. That gives you a lot of them, but not all (as your $38+83$ example shows). I wouldn't think it would be too hard to count those examples as well...after all they must begin and end in $1$ after the sum.
$endgroup$
– lulu
Dec 30 '18 at 15:01
$begingroup$
Is $2$ a semipalindrome because $2+2=4$ and $4$ is a palindrome? How about $22$?
$endgroup$
– Ross Millikan
Dec 30 '18 at 15:41
$begingroup$
Well, if there are no carries involved in the addition then you always get a palindrome on one iteration, as in $134+431=565$. That gives you a lot of them, but not all (as your $38+83$ example shows). I wouldn't think it would be too hard to count those examples as well...after all they must begin and end in $1$ after the sum.
$endgroup$
– lulu
Dec 30 '18 at 15:01
$begingroup$
Well, if there are no carries involved in the addition then you always get a palindrome on one iteration, as in $134+431=565$. That gives you a lot of them, but not all (as your $38+83$ example shows). I wouldn't think it would be too hard to count those examples as well...after all they must begin and end in $1$ after the sum.
$endgroup$
– lulu
Dec 30 '18 at 15:01
$begingroup$
Is $2$ a semipalindrome because $2+2=4$ and $4$ is a palindrome? How about $22$?
$endgroup$
– Ross Millikan
Dec 30 '18 at 15:41
$begingroup$
Is $2$ a semipalindrome because $2+2=4$ and $4$ is a palindrome? How about $22$?
$endgroup$
– Ross Millikan
Dec 30 '18 at 15:41
add a comment |
1 Answer
1
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oldest
votes
$begingroup$
If you start with a two digit number $ab$ you get a palindrome in two cases:
if $a+b lt 10$ there will be no carry so you get $11(a+b)$
if you carry $1$ and the ones digit is $1$, so when $a+b=11$
If you start with a three digit number $abc$ you get a palindrome:
- if there are no carries at all
- if $a+c =11$ so the ones digit of the sum is $1$ and there is a carry, then $2b+1$ does not carry and matches the $1$ that $a+c$ gives in the hundreds, so $b=0$
- if $a+c=11$ and $2b+1$ does carry there will be a $2$ in the hundreds, which $2b+1$ cannot match. This does not work.
$endgroup$
add a comment |
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$begingroup$
If you start with a two digit number $ab$ you get a palindrome in two cases:
if $a+b lt 10$ there will be no carry so you get $11(a+b)$
if you carry $1$ and the ones digit is $1$, so when $a+b=11$
If you start with a three digit number $abc$ you get a palindrome:
- if there are no carries at all
- if $a+c =11$ so the ones digit of the sum is $1$ and there is a carry, then $2b+1$ does not carry and matches the $1$ that $a+c$ gives in the hundreds, so $b=0$
- if $a+c=11$ and $2b+1$ does carry there will be a $2$ in the hundreds, which $2b+1$ cannot match. This does not work.
$endgroup$
add a comment |
$begingroup$
If you start with a two digit number $ab$ you get a palindrome in two cases:
if $a+b lt 10$ there will be no carry so you get $11(a+b)$
if you carry $1$ and the ones digit is $1$, so when $a+b=11$
If you start with a three digit number $abc$ you get a palindrome:
- if there are no carries at all
- if $a+c =11$ so the ones digit of the sum is $1$ and there is a carry, then $2b+1$ does not carry and matches the $1$ that $a+c$ gives in the hundreds, so $b=0$
- if $a+c=11$ and $2b+1$ does carry there will be a $2$ in the hundreds, which $2b+1$ cannot match. This does not work.
$endgroup$
add a comment |
$begingroup$
If you start with a two digit number $ab$ you get a palindrome in two cases:
if $a+b lt 10$ there will be no carry so you get $11(a+b)$
if you carry $1$ and the ones digit is $1$, so when $a+b=11$
If you start with a three digit number $abc$ you get a palindrome:
- if there are no carries at all
- if $a+c =11$ so the ones digit of the sum is $1$ and there is a carry, then $2b+1$ does not carry and matches the $1$ that $a+c$ gives in the hundreds, so $b=0$
- if $a+c=11$ and $2b+1$ does carry there will be a $2$ in the hundreds, which $2b+1$ cannot match. This does not work.
$endgroup$
If you start with a two digit number $ab$ you get a palindrome in two cases:
if $a+b lt 10$ there will be no carry so you get $11(a+b)$
if you carry $1$ and the ones digit is $1$, so when $a+b=11$
If you start with a three digit number $abc$ you get a palindrome:
- if there are no carries at all
- if $a+c =11$ so the ones digit of the sum is $1$ and there is a carry, then $2b+1$ does not carry and matches the $1$ that $a+c$ gives in the hundreds, so $b=0$
- if $a+c=11$ and $2b+1$ does carry there will be a $2$ in the hundreds, which $2b+1$ cannot match. This does not work.
answered Dec 30 '18 at 15:05
Ross MillikanRoss Millikan
300k24200375
300k24200375
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$begingroup$
Well, if there are no carries involved in the addition then you always get a palindrome on one iteration, as in $134+431=565$. That gives you a lot of them, but not all (as your $38+83$ example shows). I wouldn't think it would be too hard to count those examples as well...after all they must begin and end in $1$ after the sum.
$endgroup$
– lulu
Dec 30 '18 at 15:01
$begingroup$
Is $2$ a semipalindrome because $2+2=4$ and $4$ is a palindrome? How about $22$?
$endgroup$
– Ross Millikan
Dec 30 '18 at 15:41