A167721 Squares that become prime numbers when prefixed with a 6.

1, 121, 361, 529, 841, 961, 1681, 2401, 4489, 5929, 6889, 8281, 11449, 16129, 17161, 17689, 24649, 28561, 29929, 32041, 34969, 39601, 43681, 48841, 57121, 61009, 63001, 64009, 67081, 73441, 85849, 96721, 100489, 116281, 117649, 124609, 137641

Offset

1,2

Comments

Subsequence of squares of A032669. - Michel Marcus, Jun 22 2016

Links

G. C. Greubel, Table of n, a(n) for n = 1..10000

Mathematica

Select[Range[500]^2, PrimeQ[6 10^IntegerLength[#]+#]&] (* Harvey P. Dale, May 11 2011 *)

Crossrefs

Cf. A032669.

Sequence in context: A203856 A216166 A208242 * A330670 A253321 A253328

Adjacent sequences: A167718 A167719 A167720 * A167722 A167723 A167724

Keyword

base,nonn

Author

Claudio Meller, Nov 10 2009

Status

approved