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 A057936 Number of prime factors of 8^n + 1 (counted with multiplicity). 2
 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 Amiram Eldar, Table of n, a(n) for n = 1..354 S. S. Wagstaff, Jr., The Cunningham Project FORMULA a(n) = A057953(2n) - A057953(n). - T. D. Noe, Jun 19 2003 a(n) = A001222(A062395(n)) = A054992(3*n). - Amiram Eldar, Feb 02 2020 MATHEMATICA PrimeOmega[8^Range[100]+1] (* Harvey P. Dale, Dec 16 2014 *) PROG (MAGMA) f:=func; [f(8^n + 1):n in [1..110]]; // Marius A. Burtea, Feb 02 2020 CROSSREFS Cf. A057934-A057941, A054992. Cf. A001222, A057953, A062395. 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 May 31 16:29 EDT 2020. Contains 334748 sequences. (Running on oeis4.)