This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A057958 #24 May 22 2022 19:51:39 %S A057958 1,3,2,5,3,5,2,7,3,6,3,8,2,5,5,10,3,8,3,10,4,7,3,11,5,5,6,9,4,11,4,12, %T A057958 5,8,6,12,3,7,7,13,4,11,3,11,9,6,5,17,7,10,6,9,4,13,8,13,7,9,3,17,3,8, %U A057958 6,14,7,12,4,12,6,11,2,16,5,8,10,11,7,15,4,18,9,8,5,18,7,6,8,16,4,19,5 %N A057958 Number of prime factors of 3^n - 1 (counted with multiplicity). %H A057958 Max Alekseyev, <a href="/A057958/b057958.txt">Table of n, a(n) for n = 1..690</a> (first 660 terms from Amiram Eldar) %H A057958 S. S. Wagstaff, Jr., <a href="https://homes.cerias.purdue.edu/~ssw/cun/index.html">The Cunningham Project</a> %F A057958 Mobius transform of A085028. - _T. D. Noe_, Jun 19 2003 %F A057958 a(n) = A001222(A024023(n)). - _Amiram Eldar_, Feb 01 2020 %o A057958 (PARI) a(n)=bigomega(3^n-1) \\ _Charles R Greathouse IV_, Sep 14 2015 %Y A057958 bigomega(b^n-1): A057951 (b=10), A057952 (b=9), A057953 (b=8), A057954 (b=7), A057955 (b=6), A057956 (b=5), A057957 (b=4), this sequence (b=3), A046051 (b=2). %Y A057958 Cf. A001222, A024023, A085028, A002591 A074477, A057952, A133801, A274909. %K A057958 nonn %O A057958 1,2 %A A057958 _Patrick De Geest_, Nov 15 2000 %E A057958 Offset corrected by _Amiram Eldar_, Feb 01 2020