This site is supported by donations to The OEIS Foundation.

 Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing. Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A127669 Number of numbers mapped to A127668(n) with the map described there. 1
 1, 1, 2, 1, 2, 1, 3, 2, 2, 1, 3, 1, 2, 2, 5, 1, 3, 1, 3, 2, 2, 1, 5, 2, 2, 3, 3, 1, 3, 1, 7, 2, 2, 2, 5, 1, 2, 2, 5, 1, 3, 1, 3, 3, 2, 1, 7, 2, 3, 2, 3, 1, 5, 2, 5, 2, 2, 1, 5, 1, 2, 3, 11, 2, 3, 1, 3, 2, 3, 1, 7, 1, 2, 3, 3, 2, 3, 1, 7, 5, 2, 1, 5, 2, 2, 2, 5, 1, 5, 2, 3, 2, 2, 2, 11, 1, 3, 3, 5 (list; graph; refs; listen; history; text; internal format)
 OFFSET 2,3 COMMENTS This is not A008481(n), n>=2, which starts similarly, but differs, beginning with n=24. LINKS FORMULA a(n)<=pa(Length( A127668(n))), n>=2. Length gives the number of digits and pa(k):=A000041(k) (partition numbers). (It was originally claimed that this is equality, but that is not correct. - Franklin T. Adams-Watters, May 21 2014) EXAMPLE a(4)=2 because two numbers are mapped to 11= A127668(4), namely n=p(1)*p(1)=4 and n=p(11)=31. p(n)=A000041(n) (partition numbers). CROSSREFS Cf. a(24)=5 but A008481(24)=4. The five numbers mapped to A127668(24)= 2111 are: 18433, 2594, 2263, 292, 24. Sequence in context: A329617 A008481 A318473 * A323436 A056692 A039637 Adjacent sequences:  A127666 A127667 A127668 * A127670 A127671 A127672 KEYWORD nonn,easy,base AUTHOR Wolfdieter Lang Jan 23 2007 EXTENSIONS Edited by Franklin T. Adams-Watters, May 21 2014 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 December 13 17:17 EST 2019. Contains 329970 sequences. (Running on oeis4.)