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, 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

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: A361381 A054708 A112229 * A338095 A050979 A053450

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