The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A023595 a(n) = sum of exponents in prime-power factorization of 2*prime(n)+1. 2
 1, 1, 1, 2, 1, 3, 2, 2, 1, 1, 3, 3, 1, 2, 2, 1, 2, 2, 4, 2, 3, 2, 1, 1, 3, 2, 3, 2, 2, 1, 3, 1, 3, 3, 2, 2, 4, 2, 2, 1, 1, 3, 1, 3, 2, 3, 3, 2, 3, 4, 1, 1, 3, 1, 2, 2, 3, 2, 3, 1, 5, 1, 3, 2, 3, 2, 3, 5, 2, 2, 2, 1, 4, 3, 3, 2, 2, 3, 2, 4, 1, 2, 1, 3, 2, 1, 2, 3, 2, 3, 3, 2, 4, 1, 4, 2, 1, 2, 2 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 LINKS MATHEMATICA Array[Plus@@Last/@FactorInteger[2*Prime[ # ]+1]&, 6! ] (* Vladimir Joseph Stephan Orlovsky, Feb 28 2010 *) Total[FactorInteger[#][[All, 2]]]&/@(2*Prime[Range[100]]+1) (* Harvey P. Dale, Oct 02 2017 *) CROSSREFS Sequence in context: A290536 A277855 A136662 * A177718 A057515 A300712 Adjacent sequences:  A023592 A023593 A023594 * A023596 A023597 A023598 KEYWORD nonn AUTHOR 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 25 01:49 EST 2020. Contains 331229 sequences. (Running on oeis4.)