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A057938 Number of prime factors of 6^n + 1 (counted with multiplicity). 0
1, 1, 2, 1, 3, 3, 4, 2, 3, 3, 2, 2, 4, 3, 5, 3, 3, 6, 3, 3, 6, 4, 3, 4, 4, 4, 5, 5, 4, 9, 2, 3, 6, 3, 11, 5, 4, 3, 9, 5, 4, 7, 2, 3, 7, 5, 2, 7, 7, 6, 8, 4, 5, 10, 8, 6, 7, 3, 2, 6, 3, 2, 10, 3, 8, 11, 5, 5, 6, 7, 4, 5, 6, 5, 10, 5, 6, 11, 6, 6, 8, 4, 5, 8, 8, 5, 11, 4, 3, 16, 12, 4, 5, 5, 10, 4, 4, 5 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..98.

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

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

FORMULA

a(n) = A057955(2n) - A057955(n) - T. D. Noe, Jun 19 2003

MATHEMATICA

PrimeOmega[6^Range[100]+1] (* Harvey P. Dale, Mar 10 2013 *)

CROSSREFS

Cf. A057934-A057941, A054992.

Cf. A057955.

Sequence in context: A308057 A097686 A082666 * A144623 A218975 A048619

Adjacent sequences:  A057935 A057936 A057937 * A057939 A057940 A057941

KEYWORD

nonn

AUTHOR

Patrick De Geest, Oct 15 2000.

STATUS

approved

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Last modified July 22 16:43 EDT 2019. Contains 325225 sequences. (Running on oeis4.)