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 A192650 First differences of A192649. 2
 1, 1, 1, 1, 2, 1, 1, 3, 3, 1, 1, 4, 3, 7, 1, 1, 6, 1, 5, 3, 7, 1, 4, 3, 1, 1, 7, 5, 2, 1, 1, 14, 16, 1, 7, 8, 1, 1, 6, 5, 3, 1, 1, 7, 7, 2, 14, 1, 9, 7, 8, 7, 1, 1, 7, 5, 2, 1, 1, 6, 9, 7, 5, 3, 1, 1, 7, 9, 6, 1, 5, 2, 1, 1, 8, 15, 8, 31, 9, 9, 8, 8, 7, 23, 1, 1, 8, 7, 5, 3, 7, 1, 1, 15, 7, 24, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,5 COMMENTS Are there infinitely many pairs 1,1? LINKS Table of n, a(n) for n=1..97. MATHEMATICA start = {1, 2, 4}; f[x_, y_] := If[MemberQ[Range[1, 700], x^2 - y^2], x^2 - y^2] b[x_] := Block[{w = x}, Select[Union[ Flatten[AppendTo[w, Table[f[w[[i]], w[[j]]], {i, 1, Length[w]}, {j, 1, i}]]]], # < 700 &]]; t = FixedPoint[b, start] (* A192649 *) Differences[t] (* A192650 *) CROSSREFS Cf. A192649, A192646. Sequence in context: A335174 A082905 A141524 * A178059 A116188 A318274 Adjacent sequences: A192647 A192648 A192649 * A192651 A192652 A192653 KEYWORD nonn AUTHOR Clark Kimberling, Jul 06 2011 STATUS approved

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Last modified September 16 04:06 EDT 2024. Contains 375959 sequences. (Running on oeis4.)