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 A087419 Consider pairs (p,k) such that p is a prime, q and r are the two primes following p, 0
 1, 1, 2, 4, 1, 2, 3, 4, 2, 3, 5, 7, 10, 6, 7, 12, 8, 10, 9, 16, 23, 8, 13, 30, 40, 13, 20, 25, 27, 33, 27, 29, 20, 8, 29, 66, 37, 52, 8, 44, 71, 99, 47, 79, 59, 105, 104, 60, 106, 12, 13, 50, 121, 173, 167, 3, 49, 34, 7, 42, 42, 182, 107, 53, 157, 197, 314, 8, 335, 211, 273, 229 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 LINKS EXAMPLE a(8)=4 because A087418(8)=5; 4*(2*3*5)+7 and 4*(2*3*5)+11 are consecutive primes. CROSSREFS Cf. A002110, A087418. Sequence in context: A208645 A054708 A112229 * A050979 A053450 A215905 Adjacent sequences:  A087416 A087417 A087418 * A087420 A087421 A087422 KEYWORD nonn AUTHOR Pierre CAMI, Oct 22 2003 EXTENSIONS Edited by Don Reble, Nov 09 2005 STATUS approved

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Last modified September 21 08:38 EDT 2020. Contains 337268 sequences. (Running on oeis4.)