A013586 Smallest prime p such that n divides one of f(p)-1, f(p) or f(p)+1, where f(p) is product of primes <= p, or 0 if no such p exists.

2, 2, 2, 0, 3, 3, 3, 0, 0, 5, 7, 0, 13, 7, 5, 0, 17, 0, 7, 0, 7, 11, 23, 0, 0, 13, 0, 0, 5, 5, 5, 0, 11, 17, 7, 0, 23, 19, 13, 0, 41, 7, 43, 0, 0, 23, 47, 0, 0, 0, 17, 0, 19, 0, 11, 0, 19, 29, 13, 0, 17, 31, 0, 0, 13, 11, 67, 0, 23, 7, 71, 0, 53, 37, 0, 0, 11, 13, 29, 0, 0, 41, 83, 0, 17, 43, 29, 0

Offset

1,1

References

M. R. Mudge, Smarandache Notions Journal, University of Craiova, Vol. VII, No. 1, 1996.

Links

Table of n, a(n) for n=1..88.

Crossrefs

Sequence in context: A345730 A347791 A071443 * A071441 A134577 A071442

Adjacent sequences: A013583 A013584 A013585 * A013587 A013588 A013589

Keyword

nonn

Author

Michael R. Mudge (Amsorg(AT)aol.com)

Extensions

David W. Wilson points out that the published beginning is incorrect and has extended this sequence and supplied a better description.

Status

approved