This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A057935 Number of prime factors of 9^n + 1 (counted with multiplicity). 1
 2, 2, 3, 3, 4, 3, 4, 2, 4, 3, 4, 6, 4, 4, 6, 2, 4, 4, 4, 5, 7, 5, 4, 4, 8, 4, 5, 6, 4, 7, 5, 2, 6, 5, 9, 8, 5, 6, 7, 5, 5, 10, 7, 6, 9, 4, 4, 6, 9, 6, 8, 7, 6, 9, 8, 9, 9, 5, 3, 11, 6, 4, 11, 6, 8, 9, 9, 8, 6, 9, 5, 6, 6, 6, 13, 4, 8, 7, 5, 4, 7, 6, 5, 11, 8, 5, 8, 7, 4, 11, 7, 9, 9, 5, 9, 7, 5, 6, 10, 7, 6 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS S. S. Wagstaff, Jr., Main Tables from the Cunningham Project. S. S. Wagstaff, Jr., The Cunningham Project FORMULA a(n) = A057952(2n) - A057952(n) - T. D. Noe, Jun 19 2003 CROSSREFS Cf. A002592, A046053, A057934-A057941, A054992. Cf. A057952. Sequence in context: A324861 A324863 A269989 * A292042 A282715 A124831 Adjacent sequences:  A057932 A057933 A057934 * A057936 A057937 A057938 KEYWORD nonn AUTHOR Patrick De Geest, Oct 15 2000. STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified October 18 20:26 EDT 2019. Contains 328197 sequences. (Running on oeis4.)