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A032722 n prefixed by '5' and followed by '7' is a prime. 0
4, 5, 7, 8, 10, 14, 16, 19, 22, 23, 29, 34, 38, 40, 41, 43, 47, 50, 52, 55, 64, 65, 71, 73, 80, 82, 85, 86, 89, 92, 98, 104, 113, 115, 119, 121, 125, 128, 130, 134, 140, 142, 143, 148, 151, 157, 160, 163, 164, 176, 178, 179, 181, 182, 190, 197, 202, 205, 206, 212 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,1
LINKS
MATHEMATICA
Select[Range[250], PrimeQ[FromDigits[Join[{5}, IntegerDigits[#], {7}]]]&] (* Harvey P. Dale, Jul 24 2011 *)
CROSSREFS
Sequence in context: A189707 A120163 A088763 * A293856 A098416 A005556
KEYWORD
nonn,base
AUTHOR
Patrick De Geest, May 15 1998
STATUS
approved

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Last modified May 20 02:11 EDT 2024. Contains 372703 sequences. (Running on oeis4.)