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 A057956 Number of prime factors of 5^n - 1 (counted with multiplicity). 17
 2, 4, 3, 6, 4, 7, 3, 8, 5, 7, 3, 10, 3, 7, 7, 11, 4, 11, 5, 11, 6, 8, 4, 13, 8, 7, 9, 10, 5, 14, 4, 14, 6, 8, 9, 16, 5, 10, 6, 15, 4, 16, 4, 12, 12, 8, 3, 17, 4, 13, 8, 12, 5, 19, 10, 13, 7, 9, 4, 21, 5, 9, 11, 18, 8, 15, 7, 14, 9, 16, 4, 22, 5, 10, 16, 14, 7, 14, 5, 20, 11, 10, 5, 22, 9, 10 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Max Alekseyev, Table of n, a(n) for n = 1..502 (first 448 terms from Amiram Eldar) S. S. Wagstaff, Jr., The Cunningham Project FORMULA Mobius transform of A085030. - T. D. Noe, Jun 19 2003 a(n) = A001222(A024049(n)). - Amiram Eldar, Feb 01 2020 MATHEMATICA PrimeOmega[5^Range[90]-1] (* Harvey P. Dale, Dec 16 2017 *) CROSSREFS bigomega(b^n-1): A057951 (b=10), A057952 (b=9), A057953 (b=8), A057954 (b=7), A057955 (b=6), this sequence (b=5), A057957 (b=4), A057958 (b=3), A046051 (b=2). Cf. A001222, A024049, A074479, A085030. Sequence in context: A341844 A372713 A015049 * A151734 A175027 A269837 Adjacent sequences: A057953 A057954 A057955 * A057957 A057958 A057959 KEYWORD nonn AUTHOR Patrick De Geest, Nov 15 2000 STATUS approved

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Last modified July 14 05:06 EDT 2024. Contains 374291 sequences. (Running on oeis4.)