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A086175
Numbers n such that n*prime(n)-2 is prime.
7
3, 5, 21, 23, 25, 33, 37, 45, 57, 81, 83, 85, 93, 121, 123, 133, 137, 173, 183, 187, 193, 195, 215, 219, 225, 231, 245, 247, 285, 289, 295, 301, 315, 317, 327, 329, 353, 357, 359, 391, 395, 403, 419, 423, 429, 435, 447, 477, 479, 503, 513, 549, 561, 567, 571
OFFSET
1,1
COMMENTS
LINKS
MATHEMATICA
Select[Range[1000], PrimeQ[ # Prime[ # ]-2]&]
PROG
(Magma) [n: n in [1..800] | IsPrime(n*NthPrime(n) - 2)]; // Vincenzo Librandi, Oct 05 2012
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Zak Seidov, Jul 11 2003
STATUS
approved