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A086173 Numbers k such that k*prime(k)-1 is prime. 10
2, 8, 12, 14, 18, 30, 54, 66, 72, 80, 90, 94, 102, 110, 124, 144, 150, 160, 178, 184, 186, 198, 208, 210, 222, 224, 234, 250, 260, 264, 266, 280, 312, 336, 342, 370, 390, 400, 414, 432, 450, 462, 468, 470, 472, 476, 510, 564, 570, 596, 598, 600, 616, 652, 690 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
LINKS
MATHEMATICA
Select[Range[1000], PrimeQ[ # Prime[ # ]-1]&]
PROG
(Magma) [n: n in [1..800] | IsPrime(n*NthPrime(n) - 1)]; // Vincenzo Librandi, Oct 05 2012
CROSSREFS
Sequence in context: A107629 A080058 A005796 * A108725 A277568 A108059
KEYWORD
easy,nonn
AUTHOR
Zak Seidov, Jul 11 2003
STATUS
approved

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Last modified March 29 10:44 EDT 2024. Contains 371268 sequences. (Running on oeis4.)