The OEIS is supported by the many generous donors to the OEIS Foundation. Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A342922 Numbers k such that A342925(k) = k + 2*A003415(k). 6
 6, 28, 29, 496, 857, 1721, 8128, 164284, 6511664, 33550336 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Question: Are all odd terms in A001359? Certainly any prime p such that A003415(p+1) = p + 2 satisfies the equation. See comments in A007850. LINKS PROG (PARI) A003415(n) = if(n<=1, 0, my(f=factor(n)); n*sum(i=1, #f~, f[i, 2]/f[i, 1])); A342925(n) = A003415(sigma(n)); isA342922(n) = (A342925(n)==(n+(2*A003415(n)))); CROSSREFS Cf. A000396 (subsequence), A001359, A007850, A203617, A342923, A342924, A342925. Sequence in context: A215896 A211679 A261868 * A105402 A145551 A338125 Adjacent sequences:  A342919 A342920 A342921 * A342923 A342924 A342925 KEYWORD nonn,more AUTHOR Antti Karttunen, Apr 07 2021 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 January 24 09:42 EST 2022. Contains 350534 sequences. (Running on oeis4.)