A204984 a(n) = (1/n)*A204983(n).

1, 1, 1, 1, 3, 1, 1, 1, 7, 3, 93, 1, 315, 1, 1, 1, 15, 7, 13797, 3, 3, 93, 89, 1, 41943, 315, 9709, 1, 9256395, 1, 1, 1, 31, 15, 117, 7, 1857283155, 13797, 105, 3, 25575, 3, 381, 93, 91, 89, 178481, 1, 42799, 41943, 5, 315, 84973577874915, 9709, 19065, 1, 4599, 9256395

Offset

1,5

Comments

For a guide to related sequences, see A204892.

Links

Table of n, a(n) for n=1..58.

Mathematica

(See the program at A204979.)

Prog

(PARI) a(n) = for (k=1, oo, for (j=1, k-1, my(d=2^(k-1)-2^(j-1)); if (!(d % n), return(d/n)); ); ); \\ Michel Marcus, Sep 16 2023

Crossrefs

Cf. A204979, A204892, A204983.

Cf. A023758 (when a(n)=1).

Sequence in context: A152884 A360288 A263756 * A335341 A243473 A325969

Adjacent sequences: A204981 A204982 A204983 * A204985 A204986 A204987

Keyword

nonn

Author

Clark Kimberling, Jan 21 2012

Extensions

More terms from Michel Marcus, Sep 16 2023

Status

approved