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

Author

Claudio Meller, Nov 10 2009

Keywords

• base
• nonn

Comments

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

Links

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

Crossrefs

Cf. A032671.

Programs

Mathematica

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