A219115 Numbers whose squares have at least one 1 and one 2 in ternary representation.

4, 5, 7, 8, 10, 12, 13, 14, 15, 17, 20, 21, 22, 23, 24, 25, 26, 28, 30, 31, 32, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 49, 50, 51, 52, 53, 56, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 82, 84

Offset

1,1

Comments

So a(n)^2 belongs to A125293.

Complement of A176189.

Links

Table of n, a(n) for n=1..66.

K. Mahler, The representation of squares to the base 3, Acta Arith. Vol. 53, Issue 1 (1989), p. 99-106.

Mathematica

Select[Range[100], DigitCount[#^2, 3, 1]>0&&DigitCount[#^2, 3, 2]>0&] (* Harvey P. Dale, May 07 2015 *)

Crossrefs

Cf. A125293, A176189.

Sequence in context: A078577 A225387 A037259 * A118731 A076203 A153327

Adjacent sequences: A219112 A219113 A219114 * A219116 A219117 A219118

Keyword

nonn,base

Author

Michel Marcus, Nov 12 2012

Status

approved