A167596 The number of isolated nonprimes between the nonisolated prime and the isolated prime.

0, 3, 3, 4, 3, 4, 4, 4, 3, 3, 4, 4, 3, 5, 4, 4, 3, 6, 5, 6, 6, 6, 5, 6, 6, 6, 6, 6, 5, 6, 5, 5, 4, 4, 3, 3, 2, 2, 1, 3, 2, 2, 1, 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0

Offset: 1

Author

Juri-Stepan Gerasimov, Nov 06 2009

Keywords

• nonn

Examples

			a(1)=0 (3>no>2); a(2)=3 (5<6&12&18<23); a(3)=3 (7<12718&30<37); a(4)=4 (11<12&18&30&42<47); a(5)=3 (13<18&30&42<53); a(6)=4 (17<18&30&42&60<67).
		

Crossrefs

Cf. A001097 (the nonisolated primes), A007510 (the isolated primes), A014574 (the isolated nonprimes), A167511.

Extensions

All numbers from a(49) onwards corrected and sequence extended beyond a(59) by R. J. Mathar, May 30 2010