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A032707 n prefixed by '7' and followed by '1' is a prime. 1
0, 5, 6, 12, 15, 21, 32, 33, 35, 41, 45, 48, 54, 56, 59, 62, 68, 69, 74, 84, 90, 95, 101, 108, 116, 117, 119, 126, 134, 141, 147, 155, 167, 171, 174, 176, 182, 186, 188, 194, 197, 203, 209, 210, 216, 221, 222, 225, 227, 234, 242, 243, 246, 248, 255, 266 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Harvey P. Dale, Table of n, a(n) for n = 0..1000

MATHEMATICA

n71Q[n_]:=PrimeQ[FromDigits[Join[{7}, IntegerDigits[n], {1}]]]; Select[ Range[ 0, 300], n71Q] (* Harvey P. Dale, Jun 20 2017 *)

CROSSREFS

Sequence in context: A185031 A138925 A088767 * A240756 A127306 A319184

Adjacent sequences:  A032704 A032705 A032706 * A032708 A032709 A032710

KEYWORD

nonn,base

AUTHOR

Patrick De Geest, May 15 1998

STATUS

approved

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Last modified October 25 11:07 EDT 2021. Contains 348239 sequences. (Running on oeis4.)