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A057952 Number of prime factors of 9^n - 1 (counted with multiplicity). 3
3, 5, 5, 7, 6, 8, 5, 10, 8, 10, 7, 11, 5, 9, 11, 12, 8, 12, 7, 13, 11, 11, 6, 17, 10, 9, 13, 13, 9, 17, 8, 14, 12, 12, 11, 16, 8, 11, 15, 18, 8, 18, 6, 16, 19, 10, 10, 21, 12, 18, 15, 13, 8, 18, 15, 19, 15, 13, 7, 24, 7, 13, 19, 16, 12, 18, 8, 17, 15, 20, 9, 24, 9, 13, 22, 17, 13, 22 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..78.

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

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

FORMULA

Mobius transform of A085034 - T. D. Noe, Jun 19 2003

CROSSREFS

Cf. A057951-A057958, A046051.

Cf. A085034.

Sequence in context: A103988 A285204 A086269 * A175767 A111800 A190136

Adjacent sequences:  A057949 A057950 A057951 * A057953 A057954 A057955

KEYWORD

nonn

AUTHOR

Patrick De Geest, Nov 15 2000.

STATUS

approved

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Last modified February 20 15:20 EST 2019. Contains 320336 sequences. (Running on oeis4.)