A138325 Least prime p such that n = p + g, where g is a primitive root of p, or 0 if there is no such prime p.
0, 0, 2, 0, 3, 0, 5, 5, 0, 7, 0, 7, 11, 0, 13, 0, 11, 11, 11, 13, 19, 17, 17, 13, 0, 0, 17, 17, 17, 23, 17, 19, 19, 19, 0, 0, 23, 23, 29, 23, 0, 23, 23, 23, 0, 43, 29, 29, 0, 29, 0, 31, 31, 37, 29, 29, 37, 41, 37, 41, 37, 43, 41, 0, 41, 47, 41, 61, 37, 41, 41, 37, 43, 53, 41, 41, 43, 47
Offset: 1
Keywords
Links
- T. D. Noe, Table of n, a(n) for n=1..1000
Crossrefs
Cf. A060749 (primitive roots).
Comments