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A139071
Numbers k for which (10+k!)/10 is prime.
21
5, 6, 11, 12, 15, 23, 26, 37, 45, 108, 112, 129, 137, 148, 172, 248, 760, 807, 975, 1398, 5231, 8765, 24182
OFFSET
1,1
COMMENTS
Primes of the form (10+k!)/10 see A139070.
a(24) > 25000. - Robert Price, Nov 08 2016
MATHEMATICA
a = {}; Do[If[PrimeQ[(n! + 10)/10], AppendTo[a, n]], {n, 1, 500}]; a
PROG
(PARI) for(k=5, 1e3, if(ispseudoprime(k!/10+1), print1(k", "))) \\ Charles R Greathouse IV, Jul 15 2011
KEYWORD
nonn
AUTHOR
Artur Jasinski, Apr 07 2008
EXTENSIONS
More terms from Serge Batalov, Feb 18 2015
a(22)-a(23) from Robert Price, Nov 08 2016
STATUS
approved