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A057936 Number of prime factors of 8^n + 1 (counted with multiplicity). 1
2, 2, 4, 2, 4, 4, 4, 3, 6, 6, 5, 4, 4, 6, 7, 3, 6, 6, 5, 4, 7, 6, 5, 5, 7, 10, 10, 5, 5, 11, 5, 3, 9, 9, 11, 6, 7, 8, 7, 6, 7, 10, 6, 7, 12, 8, 7, 7, 7, 14, 11, 5, 6, 10, 12, 8, 9, 8, 8, 8, 4, 9, 13, 4, 11, 12, 8, 9, 8, 15, 8, 8, 6, 10, 12, 8, 12, 17, 6, 7, 15, 10, 9, 12, 12, 10, 11, 8, 8, 18, 12 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..91.

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

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

FORMULA

a(n) = A057953(2n) - A057953(n) - T. D. Noe, Jun 19 2003

MATHEMATICA

PrimeOmega[8^Range[100]+1] (* Harvey P. Dale, Dec 16 2014 *)

CROSSREFS

Cf. A057934-A057941, A054992.

Cf. A057953.

Sequence in context: A100008 A102763 A054844 * A033097 A036845 A094269

Adjacent sequences:  A057933 A057934 A057935 * A057937 A057938 A057939

KEYWORD

nonn

AUTHOR

Patrick De Geest, Oct 15 2000.

STATUS

approved

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Last modified June 25 17:47 EDT 2019. Contains 324353 sequences. (Running on oeis4.)