A167738 Primes that become squares when prefixed with a 5.

29, 929, 2441, 3361, 4289, 7121, 8081, 9049, 19841, 34361, 49081, 61001, 76081, 88289, 94441, 112121, 121169, 148361, 193841, 230369, 239521, 276209, 322249, 377761, 414929, 461569, 536609, 564881, 583769, 602689, 621641, 707321, 745609

Offset: 1

Author

Claudio Meller, Nov 10 2009

Keywords

• base
• nonn
• changed

Links

• Alois P. Heinz, Table of n, a(n) for n = 1..20000 (first 156 terms from Vincenzo Librandi)

Crossrefs

Cf. A167734, A167735, A167736, A167737, A167739, A167740, A167741.

Programs

Mathematica

Select[Prime[Range[10000]], IntegerQ[Sqrt[FromDigits[Join[{5}, IntegerDigits[#]]]]]&] (* G. C. Greubel, Jun 23 2016 *)

Extensions

More terms from Michel Marcus, Aug 05 2013