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A032708 n prefixed by '8' and followed by '1' is a prime. 0
1, 2, 8, 10, 11, 16, 17, 19, 22, 23, 29, 31, 43, 46, 50, 52, 58, 64, 68, 73, 74, 76, 82, 83, 86, 94, 95, 97, 100, 103, 104, 107, 110, 113, 118, 128, 133, 137, 140, 142, 155, 161, 167, 170, 176, 190, 193, 197, 202, 203, 205, 214, 217, 223, 224, 226, 230, 235 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..57.

MATHEMATICA

Select[Range[250], PrimeQ[FromDigits[Join[{8}, IntegerDigits[#], {1}]]]&]  (* Harvey P. Dale, Mar 24 2011 *)

CROSSREFS

Sequence in context: A005876 A139370 A101532 * A282094 A084124 A081693

Adjacent sequences:  A032705 A032706 A032707 * A032709 A032710 A032711

KEYWORD

nonn,base

AUTHOR

Patrick De Geest, May 15 1998

STATUS

approved

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Last modified December 6 13:45 EST 2021. Contains 349563 sequences. (Running on oeis4.)