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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<k<q and k*primorial(p)+q and k*primorial(p)+r are consecutive primes; sequence gives values of k. 1
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

Table of n, a(n) for n=1..72.

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.)