A167718 Squares that becomes primes when prefixed with a 3.

1, 49, 121, 169, 361, 529, 1849, 2401, 3721, 6241, 8281, 9409, 11881, 14161, 14641, 19321, 20449, 25921, 27889, 39601, 49729, 51529, 52441, 69169, 76729, 83521, 89401, 94249, 104329, 113569, 124609, 143641, 165649, 175561, 187489, 190969

Offset

1,2

Links

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

Mathematica

Select[Range[1, 4000, 2]^2, PrimeQ[FromDigits[Join[{3}, IntegerDigits[#]]]] &] (* G. C. Greubel, Jun 21 2016 *)

Crossrefs

Sequence in context: A227863 A339131 A115557 * A080665 A130007 A202331

Adjacent sequences: A167715 A167716 A167717 * A167719 A167720 A167721

Keyword

base,nonn

Author

Claudio Meller, Nov 10 2009

Extensions

Definition modified by Harvey P. Dale, Oct 14 2017

Status

approved