A064131 Number of divisors of 3^n + 1 that are relatively prime to 3^m + 1 for all 0 < m < n.

2, 3, 2, 2, 2, 2, 2, 2, 4, 4, 2, 4, 2, 2, 4, 4, 2, 8, 2, 4, 2, 4, 4, 2, 8, 4, 4, 4, 4, 8, 2, 4, 2, 4, 4, 2, 2, 8, 4, 16, 4, 4, 4, 2, 8, 4, 4, 8, 4, 4, 8, 8, 4, 4, 2, 4, 8, 8, 4, 4, 8, 4, 8, 16, 2, 2, 2, 4, 8, 32, 8, 32, 4, 4, 8, 16, 16, 2, 4, 8, 8, 32, 8, 16, 32, 8, 32, 32, 8, 8, 4

Offset

0,1

Links

Table of n, a(n) for n=0..90.

Sam Wagstaff, Cunningham Project, Factorizations of 3^n-1, n odd, n<540

Mathematica

a[0]=2; a[n_] := Length@ Select[Divisors[3^n+1], GCD[Times @@ (3^Range[1, n-1] + 1), #] == 1 &]; Array[a, 91, 0] (* Giovanni Resta, Jul 02 2018 *)

Prog

(PARI) a(n) = if (n==0, 2, sumdiv(3^n+1, d, vecsum(vector(n-1, k, gcd(d, 3^k+1) == 1)) == n-1)); \\ Michel Marcus, Jun 24 2018

Crossrefs

Cf. A064132, A064133, A064134, A064135, A064136, A064137.

Sequence in context: A120881 A297930 A031217 * A368859 A338238 A355077

Adjacent sequences: A064128 A064129 A064130 * A064132 A064133 A064134

Keyword

nonn

Author

Robert G. Wilson v, Sep 10 2001

Extensions

a(1) corrected and extended by Michel Marcus, Jul 02 2018

Status

approved