A032713 - OEIS

A032713

Numbers k such that k prefixed by '5' and followed by '3' is prime.

0, 2, 6, 9, 11, 15, 23, 27, 30, 32, 33, 39, 41, 44, 48, 50, 56, 57, 62, 65, 68, 69, 74, 78, 81, 84, 90, 92, 95, 104, 113, 119, 120, 126, 128, 134, 138, 141, 147, 150, 156, 159, 161, 167, 168, 171, 180, 185, 189, 191, 197, 210, 215, 216, 218, 222, 225, 231

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OFFSET

1,2

LINKS

Table of n, a(n) for n=1..58.

MATHEMATICA

Select[Range[0, 250], PrimeQ[FromDigits[Join[{5}, IntegerDigits[#], {3}]]]&] (* Harvey P. Dale, Mar 28 2013 *)

CROSSREFS

Sequence in context: A191252 A026348 A187483 * A257475 A086939 A174682

Adjacent sequences: A032710 A032711 A032712 * A032714 A032715 A032716

KEYWORD

nonn,base

AUTHOR

Patrick De Geest, May 15 1998

STATUS

approved