A060810 Numbers whose squares have their digits in strictly increasing order.

0, 1, 2, 3, 4, 5, 6, 7, 13, 16, 17, 37, 116, 117, 367

Offset

1,3

Links

Table of n, a(n) for n=1..15.

Formula

a(n) = sqrt(A122683(n)).

Example

117^2 = 13689 and 1 < 3 < 6 < 8 < 9.

Mathematica

Select[Range[0, 400], Min[Differences[IntegerDigits[#^2]]]>0&] (* Harvey P. Dale, Oct 06 2024 *)

Crossrefs

Cf. A122683.

Sequence in context: A125745 A265124 A032990 * A319723 A271377 A363331

Adjacent sequences: A060807 A060808 A060809 * A060811 A060812 A060813

Keyword

base,easy,full,nonn,fini

Author

Erich Friedman, Apr 29 2001

Status

approved