A032708 - OEIS

A032708

Numbers k such that k prefixed by '8' and followed by '1' is prime.

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

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OFFSET

1,2

LINKS

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

MATHEMATICA

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

CROSSREFS

Cf. A032702-A032733.

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

EXTENSIONS

Offset changed by Andrew Howroyd, Aug 11 2024

STATUS

approved