A080162 Wonderful Demlo numbers A002477 whose digit sums are squares.

1, 121, 12321, 1234321, 123454321, 12345654321, 1234567654321, 123456787654321, 12345678987654321, 12345679012345679012345679012345678987654320987654320987654320987654321

Offset

1,2

Links

Jeppe Stig Nielsen, Table of n, a(n) for n = 1..23

Eric Weisstein's World of Mathematics, Demlo Number

Prog

(PARI) for(k=1, 100, my(d=((10^k-1)/9)^2); issquare(sumdigits(d)) && print1(d, ", ")) \\ Jeppe Stig Nielsen, May 27 2023

Crossrefs

Cf. A080160, A080161, A002477, A080151.

Sequence in context: A173426 A261570 A068117 * A030174 A180153 A178510

Adjacent sequences: A080159 A080160 A080161 * A080163 A080164 A080165

Keyword

nonn,base

Author

Eric W. Weisstein, Jan 31 2003

Status

approved