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

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A254608 a(n) is the smallest number such that A254606(a(n)) = n. 1
 1, 2, 9, 14, 27, 26, 34, 63, 64, 53, 89, 115, 88, 165, 101, 116, 132, 292, 149, 185, 166, 225, 271, 205, 270, 318, 247, 397, 294, 293, 319, 370, 371, 344, 399, 398, 427, 691, 489, 488, 553, 552, 520, 655, 658, 620, 622, 769, 621, 693, 656, 731, 851, 810, 732 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Lei Zhou, Table of n, a(n) for n = 0..10000 EXAMPLE A254606(1)=0, so a(0)=1; A254606(2)=1, so a(1)=2; A254606(m)<2 for all m<9, and A254606(9)=2, so a(2)=9. MATHEMATICA NumDiff[n1_, n2_] :=  Module[{c1 = n1, c2 = n2}, If[c1 < c2, c1 = c1 + c2; c2 = c1 - c2; c1 = c1 - c2];   k = Floor[c1/c2]; a1 = c1 - k*c2; If[a1 == 0, a2 = 0, a2 = (k + 1) c2 - c1]; Return[Min[a1, a2]]]; a = {1}; n = 0; p1 = 2; p2 = 1; lb = 0; While[lb < 100, n++; p2 = NextPrime[p2]; If[p2 > p1, p1 = p2; p2 = 2]; d = NumDiff[p1, p2]; While[l = Length[a]; l <= d, AppendTo[a, 0]]; If[a[[d + 1]] == 0, a[[d + 1]] = n; ps = Position[a, 0]; If[Length[ps] == 0, b = a, ps1 = ps[[1]][[1]]; b = Take[a, ps1 - 1]]; lb = Length[b]]]; b CROSSREFS Cf. A254606. Sequence in context: A242466 A071344 A224855 * A324275 A106360 A024470 Adjacent sequences:  A254605 A254606 A254607 * A254609 A254610 A254611 KEYWORD nonn AUTHOR Lei Zhou, Feb 02 2015 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 8 20:37 EST 2021. Contains 349596 sequences. (Running on oeis4.)