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A167718
Squares that becomes primes when prefixed with a 3.
1
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
MATHEMATICA
Select[Range[1, 4000, 2]^2, PrimeQ[FromDigits[Join[{3}, IntegerDigits[#]]]] &] (* G. C. Greubel, Jun 21 2016 *)
CROSSREFS
Sequence in context: A339131 A374290 A115557 * A080665 A130007 A202331
KEYWORD
base,nonn
AUTHOR
Claudio Meller, Nov 10 2009
EXTENSIONS
Definition modified by Harvey P. Dale, Oct 14 2017
STATUS
approved