A255367 - OEIS

A255367

a(n) = r^(p-2) mod p, where p is the n-th prime and r is the least positive primitive root of p.

1, 2, 3, 5, 6, 7, 6, 10, 14, 15, 21, 19, 7, 29, 19, 27, 30, 31, 34, 61, 44, 53, 42, 30, 39, 51, 62, 54, 91, 38, 85, 66, 46, 70, 75, 126, 63, 82, 67, 87, 90, 91, 181, 116, 99, 133, 106, 149, 114, 191, 78, 205, 69, 42, 86, 158, 135, 226, 111, 94, 189, 147, 123

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OFFSET

1,2

COMMENTS

a(n) is the last element of row n of A254309.

LINKS

Alois P. Heinz, Table of n, a(n) for n = 1..10000

FORMULA

a(n) = r^(p-2) mod p, with p = A000040(n) and r = A001918(n).

MAPLE

a:= n-> (p-> numtheory[primroot](p)&^(p-2) mod p)(ithprime(n)):

seq(a(n), n=1..70);