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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 A357358 A315925
KEYWORD
nonn
AUTHOR
Zak Seidov, Oct 25 2002
STATUS
approved

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Last modified April 23 18:16 EDT 2024. Contains 371916 sequences. (Running on oeis4.)