A032732 n prefixed by '7' and followed by '9' is a prime.

0, 1, 3, 6, 10, 12, 15, 21, 22, 30, 34, 36, 45, 48, 49, 52, 54, 55, 58, 63, 64, 66, 69, 75, 78, 82, 87, 91, 94, 103, 105, 106, 108, 111, 112, 120, 124, 132, 133, 135, 138, 139, 141, 142, 147, 154, 156, 169, 171, 178, 180, 184, 187, 189, 190, 199, 201, 208, 210

Offset

0,3

Links

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

Mathematica

Select[Range[0, 300], PrimeQ[FromDigits[Join[{7}, IntegerDigits[#], {9}]]]&] (* Harvey P. Dale, Dec 03 2021 *)

Crossrefs

Sequence in context: A007960 A339213 A280243 * A187352 A310044 A157772

Adjacent sequences: A032729 A032730 A032731 * A032733 A032734 A032735

Keyword

nonn,base

Author

Patrick De Geest, May 15 1998

Status

approved