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A057935 Number of prime factors of 9^n + 1 (counted with multiplicity). 1
2, 2, 3, 3, 4, 3, 4, 2, 4, 3, 4, 6, 4, 4, 6, 2, 4, 4, 4, 5, 7, 5, 4, 4, 8, 4, 5, 6, 4, 7, 5, 2, 6, 5, 9, 8, 5, 6, 7, 5, 5, 10, 7, 6, 9, 4, 4, 6, 9, 6, 8, 7, 6, 9, 8, 9, 9, 5, 3, 11, 6, 4, 11, 6, 8, 9, 9, 8, 6, 9, 5, 6, 6, 6, 13, 4, 8, 7, 5, 4, 7, 6, 5, 11, 8, 5, 8, 7, 4, 11, 7, 9, 9, 5, 9, 7, 5, 6, 10, 7, 6 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..101.

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

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

FORMULA

a(n) = A057952(2n) - A057952(n) - T. D. Noe, Jun 19 2003

CROSSREFS

Cf. A002592, A046053, A057934-A057941, A054992.

Cf. A057952.

Sequence in context: A324861 A324863 A269989 * A292042 A282715 A124831

Adjacent sequences:  A057932 A057933 A057934 * A057936 A057937 A057938

KEYWORD

nonn

AUTHOR

Patrick De Geest, Oct 15 2000.

STATUS

approved

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Last modified October 18 20:26 EDT 2019. Contains 328197 sequences. (Running on oeis4.)