A167724 Squares that becomes a prime number when prefixed with a 9.

1369, 2401, 2809, 3481, 5929, 9409, 10201, 14161, 16129, 17689, 25921, 28561, 32761, 41209, 44521, 64009, 94249, 100489, 108241, 116281, 117649, 130321, 137641, 146689, 157609, 170569, 175561, 177241, 196249, 201601, 218089, 219961

Offset: 1

Author

Claudio Meller, Nov 10 2009

Keywords

• base
• nonn

Comments

Subsequence of squares of A032672. - Michel Marcus, Jun 22 2016

Links

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

Crossrefs

Cf. A032672.

Programs

Mathematica

Select[Range[1, 500000, 2]^2, PrimeQ[FromDigits[Join[{9}, IntegerDigits[#]]]] &] (* G. C. Greubel, Jun 21 2016 *)