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 A076672 Smallest a(n)>a(n-1) such that a(n)^2+a(n-1)^2 is a perfect square, a(1)=6. 0
 6, 8, 15, 20, 21, 28, 45, 60, 63, 84, 112, 180, 189, 252, 275, 660, 693, 924, 1232, 1326, 1768, 1974, 2632, 4026, 5368, 6405, 8200, 8319, 11092, 11715, 15620, 16401, 19720, 20706, 20880, 20910, 24752, 24960, 25300, 26565, 29716 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The sequence is infinite. LINKS MATHEMATICA Clear[nxt]; nxt[n_]:=Module[{i=n+1}, While[!IntegerQ[Sqrt[n^2+i^2]], i++]; i]; NestList[nxt, 6, 40] (* Harvey P. Dale, Dec 03 2010 *) CROSSREFS Cf. A076600, A076671 (starting at 5). Sequence in context: A315922 A315923 A100914 * A315924 A315925 A315926 Adjacent sequences:  A076669 A076670 A076671 * A076673 A076674 A076675 KEYWORD nonn AUTHOR Zak Seidov, Oct 25 2002 STATUS approved

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Last modified December 2 10:39 EST 2020. Contains 338876 sequences. (Running on oeis4.)