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!)
 A057159 Numbers n such that n divides s(n-1), where s(1) = 1, s(n) = s(n-1) + (n+1)*3^n. 1
 4, 13, 35, 52, 95, 119, 169, 676, 11596, 57577, 159484, 276773 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS No other terms below 300000. - Vaclav Kotesovec, May 05 2018 s(n) = 1, 28, 136, 541, 1999, 7102, 24598,... 4*s(n) = 3^(n+1)*(2n+1)-23, with g.f. x*(-1-21*x+45*x^2) / ( (x-1)*(-1+3*x)^2 ). - R. J. Mathar, May 05 2018 LINKS MATHEMATICA seq = RecurrenceTable[{s[n] == s[n - 1] + (n + 1)*3^n, s[1] == 1}, s, {n, 1, 20000}]; Select[Range[1, Length[seq]], Divisible[seq[[# - 1]], #] &] (* Vaclav Kotesovec, May 05 2018 *) CROSSREFS Sequence in context: A127981 A296303 A089453 * A189588 A266357 A095941 Adjacent sequences:  A057156 A057157 A057158 * A057160 A057161 A057162 KEYWORD nonn,more AUTHOR Robert G. Wilson v, Sep 13 2000 EXTENSIONS Minor edits by Altug Alkan, May 05 2018 a(10)-a(12) from Vaclav Kotesovec, May 05 2018 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 6 04:14 EST 2019. Contains 329784 sequences. (Running on oeis4.)