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A057956 Number of prime factors of 5^n - 1 (counted with multiplicity). 2
2, 4, 3, 6, 4, 7, 3, 8, 5, 7, 3, 10, 3, 7, 7, 11, 4, 11, 5, 11, 6, 8, 4, 13, 8, 7, 9, 10, 5, 14, 4, 14, 6, 8, 9, 16, 5, 10, 6, 15, 4, 16, 4, 12, 12, 8, 3, 17, 4, 13, 8, 12, 5, 19, 10, 13, 7, 9, 4, 21, 5, 9, 11, 18, 8, 15, 7, 14, 9, 16, 4, 22, 5, 10, 16, 14, 7, 14, 5, 20, 11, 10, 5, 22, 9, 10 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

LINKS

S. S. Wagstaff, Jr., Main Tables from the Cunningham Project.

S. S. Wagstaff, Jr., The Cunningham Project

FORMULA

Mobius transform of A085030 - T. D. Noe (noe(AT)sspectra.com), Jun 19 2003

CROSSREFS

Cf. A057951-A057958, A046051.

Cf. A085030.

Sequence in context: A072937 A129509 A015049 * A151734 A175027 A182732

Adjacent sequences:  A057953 A057954 A057955 * A057957 A057958 A057959

KEYWORD

nonn

AUTHOR

Patrick De Geest (pdg(AT)worldofnumbers.com), Nov 15 2000.

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Last modified February 15 14:02 EST 2012. Contains 205811 sequences.