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 A117623 Values of k associated with A117622. 1
 3, 2, 4, -1, 5, -6, 7, 9, -12, 8, 10, -14, 11, 13, -22, 15, 16, -28, 17, 18, -34, 20, 21, -38, 19, 24, -42, 25, -23, 26, 27, -49, 30, 29, -57, 31, 33, -63, 35, 32, -66, 36, 39, -72, 37, 40, -71, 41, 43, -83, 44, 45, -87, 46, 47, -91, 50, -48, 52, 51, -100, 53, 54, -105, 55, 56, -110, 59, 58, -115, 60 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Does every positive number appear as an absolute value? LINKS Table of n, a(n) for n=1..71. MATHEMATICA f[s_] := Block[{k = 1, d = Abs[Most@s - Rest@s], l = Last@s}, While[ PrimeQ[k] || MemberQ[s, k] || MemberQ[d, Abs[l - k]], k++ ]; Append[s, k]]; t = Nest[f, {1}, 71]; Rest@t - Most@t (* Robert G. Wilson v, Jun 13 2006 *) CROSSREFS Sequence in context: A122143 A144868 A134029 * A145690 A259053 A161911 Adjacent sequences: A117620 A117621 A117622 * A117624 A117625 A117626 KEYWORD sign AUTHOR Amarnath Murthy, Apr 08 2006 EXTENSIONS More terms from Jonathan Vos Post, Apr 10 2006 Corrected and extended by Robert G. Wilson v, Jun 13 2006 STATUS approved

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Last modified May 18 16:58 EDT 2024. Contains 372664 sequences. (Running on oeis4.)