

A165550


Sum of digits of square is sum of square of digits.


3



0, 1, 2, 3, 10, 20, 30, 33, 100, 200, 300, 330, 333, 1000, 1143, 1431, 2000, 2242, 3000, 3233, 3300, 3330, 3331, 3333, 3411, 3433, 4131, 10000, 11234, 11243, 11344, 11403, 11430, 11432, 11433, 12235, 12523, 13134, 13142, 13144, 13241, 13431, 13522
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OFFSET

1,3


LINKS

Rémy Sigrist, Table of n, a(n) for n = 1..10000


EXAMPLE

Consider n=33: n^2 is 1089, sum of square of digits is 3^2+3^2=18, and sum of digits of square is 1+0+8+9=18, thus 33 appears in the sequence.


PROG

(PARI) digsum(n) = my(s=0); while(n, s=s+n%10; n=n\10); s;
sqadigsum(n) = my(s=0); while(n, s=s+(n%10)^2; n=n\10); s;
for(n=0, 100000, if(sqadigsum(n)==digsum(n^2), print1(n, ", ") ) )


CROSSREFS

Sequence in context: A295951 A083944 A306106 * A328780 A184261 A095919
Adjacent sequences: A165547 A165548 A165549 * A165551 A165552 A165553


KEYWORD

base,easy,nonn


AUTHOR

Rémy Sigrist, Sep 21 2009


EXTENSIONS

Offset fixed by Rémy Sigrist, Feb 03 2017


STATUS

approved



