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 A261639 Values of n such that prime(n+1)!/prime(n) + 1 is a prime number. 0
 2, 3, 4, 5, 19, 110 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS a(1) = 2, a(2) = 3, a(3) = 4, a(4) = 5. It can be seen as a nice consecutiveness on sequence for first four items. Another point is that sequence of prime(n+1)! / prime(n) is observed in A260754. a(7) > 2300. - Giovanni Resta, Aug 28 2015 LINKS Table of n, a(n) for n=1..6. EXAMPLE For n=2 the (prime(n+1)! / prime(n)) + 1 = 41. 41 is prime. PROG (PARI) for(n=1, 1e3, if(isprime(k=((prime(n+1)!/prime(n))+1)), print1(n", "))) CROSSREFS Cf. A260754. Sequence in context: A061412 A295317 A165646 * A333993 A362064 A342617 Adjacent sequences: A261636 A261637 A261638 * A261640 A261641 A261642 KEYWORD nonn,more AUTHOR Altug Alkan, Aug 27 2015 STATUS approved

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Last modified July 24 22:37 EDT 2024. Contains 374585 sequences. (Running on oeis4.)