The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A366628 Number of divisors of 6^n+1. 9
 2, 2, 2, 4, 2, 8, 8, 12, 4, 8, 8, 4, 4, 16, 8, 32, 8, 8, 64, 8, 8, 48, 16, 8, 16, 16, 16, 32, 32, 16, 512, 4, 8, 64, 8, 1536, 32, 16, 8, 512, 32, 16, 128, 4, 8, 128, 32, 4, 128, 64, 64, 256, 16, 32, 1024, 192, 64, 128, 8, 4, 64, 8, 4, 768, 8, 256, 2048, 32, 32 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS Max Alekseyev, Table of n, a(n) for n = 0..420 FORMULA a(n) = sigma0(6^n+1) = A000005(A062394(n)). EXAMPLE a(3)=4 because 6^3+1 has divisors {1, 7, 31, 217}. MAPLE a:=n->numtheory[tau](6^n+1): seq(a(n), n=0..100); PROG (PARI) a(n) = numdiv(6^n+1); CROSSREFS Cf. A062394, A000005, A057938, A366621, A366627, A366629, A366630, A366670. Cf. A046798, A366577, A366606, A366616, A366637, A366656, A366665, A344897, A366688, A366714. Sequence in context: A035580 A135293 A216951 * A320305 A064025 A182154 Adjacent sequences: A366625 A366626 A366627 * A366629 A366630 A366631 KEYWORD nonn AUTHOR Sean A. Irvine, Oct 14 2023 STATUS approved

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

Last modified August 10 17:16 EDT 2024. Contains 375058 sequences. (Running on oeis4.)