A215614 Numbers n that are not multiples of 10 such that sum of digits of n^2 is 7.

4, 5, 32, 49, 149, 1049

Offset

1,1

Comments

Sequence is complete.

Except for the number 1, these six and numbers 10^k+1 (A062397) are the only numbers (up to trailing 0's) whose square has sum of digits less than 9. - M. F. Hasler, Sep 23 2014

Links

Table of n, a(n) for n=1..6.

Mathematica

Select[Range[1500], Mod[#, 10]!=0&&Total[IntegerDigits[#^2]]==7&] (* Harvey P. Dale, Aug 21 2022 *)

Prog

(PARI) for(n=1, 9e9, n%10&&sumdigits(n^2)==7&&print1(n", ")) \\ M. F. Hasler, Sep 23 2014

Crossrefs

Cf. A004159 = Sum of digits of n^2.

Sequence in context: A335526 A373190 A262711 * A013468 A376536 A378079

Adjacent sequences: A215611 A215612 A215613 * A215615 A215616 A215617

Keyword

nonn,base,fini,full

Author

Zak Seidov, Aug 17 2012

Status

approved