A167723 Squares that become prime numbers when prefixed with an 8.

9, 81, 2601, 3969, 4761, 6561, 25281, 31329, 35721, 56169, 59049, 68121, 71289, 91809, 131769, 149769, 168921, 194481, 199809, 210681, 221841, 263169, 301401, 335241, 370881, 423801, 439569, 463761, 480249, 576081, 603729, 613089, 622521

Offset

1,1

Comments

Subsequence of squares of A032671. - Michel Marcus, Jun 22 2016

Links

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

Mathematica

Select[Range[1, 500000, 2]^2, PrimeQ[FromDigits[Join[{8}, IntegerDigits[#]]]] &] (* G. C. Greubel, Jun 21 2016 *)

Crossrefs

Cf. A032671.

Sequence in context: A110853 A371640 A344402 * A203107 A168493 A003302

Adjacent sequences: A167720 A167721 A167722 * A167724 A167725 A167726

Keyword

base,nonn

Author

Claudio Meller, Nov 10 2009

Status

approved