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

1,2

Links

Table of n, a(n) for n=1..105.

Example

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.

Sequence in context: A342928 A236442 A046537 * A216190 A267592 A243341

Adjacent sequences: A167593 A167594 A167595 * A167597 A167598 A167599

Keyword

nonn

Author

Juri-Stepan Gerasimov, Nov 06 2009

Extensions

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

Status

approved