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A032706 n prefixed by '6' and followed by '1' is a prime. 1
0, 3, 4, 6, 9, 10, 12, 13, 15, 21, 22, 27, 30, 31, 36, 42, 45, 48, 49, 52, 55, 57, 58, 66, 69, 70, 76, 78, 79, 84, 87, 91, 96, 97, 99, 100, 103, 105, 109, 112, 114, 115, 121, 123, 126, 129, 133, 138, 144, 147, 151, 156, 163, 165, 168, 175, 178, 186, 187, 196 (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

Select[Range[0, 200], PrimeQ[FromDigits[Join[{6}, IntegerDigits[#], {1}]]]&] (* Harvey P. Dale, Jun 20 2020 *)

CROSSREFS

Sequence in context: A138670 A080336 A082692 * A153464 A288463 A189297

Adjacent sequences:  A032703 A032704 A032705 * A032707 A032708 A032709

KEYWORD

nonn,base

AUTHOR

Patrick De Geest, May 15 1998

STATUS

approved

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Last modified October 17 13:24 EDT 2021. Contains 348049 sequences. (Running on oeis4.)