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

 Please make a donation to keep the OEIS running. We are now in our 56th year. In the past year we added 10000 new sequences and reached almost 9000 citations (which often say "discovered thanks to the OEIS"). Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A127397 a(0)=0; a(n) = smallest positive integer not occurring earlier in the sequence such that a(n-1)+a(n) = j^k, j = any positive integer, k = any integer >= 2. 3
 0, 1, 3, 5, 4, 12, 13, 14, 2, 6, 10, 15, 17, 8, 19, 30, 34, 47, 53, 11, 16, 9, 7, 18, 31, 33, 48, 52, 29, 20, 44, 37, 27, 22, 42, 39, 25, 24, 40, 41, 23, 26, 38, 43, 21, 28, 36, 45, 55, 66, 59, 62, 63, 58, 67, 54, 46, 35, 65, 56, 69, 75, 50, 71, 57, 64, 61, 60, 68, 32, 49, 51, 70 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS Rémy Sigrist, Table of n, a(n) for n = 0..10000 MATHEMATICA f[n_] := n == 1 || GCD @@ Last /@ FactorInteger[n] > 1; g[l_List] := Block[{k = 1}, While[MemberQ[l, k] || ! f[k + l[[ -1]]], k++ ]; Append[l, k]]; Nest[g, {0}, 73] (* Ray Chandler, Jan 22 2007 *) CROSSREFS Cf. A001597, A034175, A127398. Sequence in context: A078439 A007063 A335500 * A284048 A326119 A201271 Adjacent sequences:  A127394 A127395 A127396 * A127398 A127399 A127400 KEYWORD nonn,look AUTHOR Leroy Quet, Jan 12 2007 EXTENSIONS Extended by Ray Chandler, Jan 22 2007 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 November 26 07:48 EST 2020. Contains 338632 sequences. (Running on oeis4.)