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A032720 n prefixed by '3' and followed by '7' is a prime. 0
0, 1, 3, 4, 6, 9, 13, 16, 18, 21, 25, 30, 34, 40, 45, 46, 51, 52, 54, 55, 60, 61, 63, 67, 69, 72, 76, 79, 84, 87, 90, 91, 94, 96, 114, 117, 123, 124, 126, 127, 130, 132, 133, 135, 138, 139, 147, 151, 154, 156, 160, 162, 165, 166, 168, 172, 181, 184, 190, 195 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..59.

MATHEMATICA

Select[Range[0, 250], PrimeQ[FromDigits[Join[{3}, IntegerDigits[#], {7}]]]&]  [From Harvey P. Dale, Dec. 19, 2010]

CROSSREFS

Sequence in context: A140570 A285303 A135072 * A289117 A167928 A090867

Adjacent sequences:  A032717 A032718 A032719 * A032721 A032722 A032723

KEYWORD

nonn,base

AUTHOR

Patrick De Geest, May 15 1998

STATUS

approved

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Last modified March 18 19:58 EDT 2019. Contains 321293 sequences. (Running on oeis4.)