A138325 - OEIS

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

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OFFSET

1,3

COMMENTS

Sequence A138128 gives the number of representations for each n and sequence A138326 lists the values of n that are not represented.

LINKS

T. D. Noe, Table of n, a(n) for n=1..1000

CROSSREFS

Cf. A060749 (primitive roots).

Sequence in context: A325346 A325836 A011013 * A258323 A117175 A228086

Adjacent sequences: A138322 A138323 A138324 * A138326 A138327 A138328

KEYWORD

nonn

AUTHOR

T. D. Noe, Mar 14 2008

STATUS

approved