This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A076673 Smallest a(n)>a(n-1) such that a(n)^2+a(n-1)^2 is a perfect square, a(1)=7. 1
 7, 24, 32, 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, 29835, 33048, 35055, 41496 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The sequence is infinite. LINKS MATHEMATICA nxt[n_]:= Module[{k = n + 1}, While[!IntegerQ[Sqrt[n^2 + k^2]], k++]; k]; NestList[nxt, 7, 40] (* Harvey P. Dale, May 29 2015 *) CROSSREFS Cf. A076600. Sequence in context: A076602 A287132 A287193 * A270422 A063165 A154612 Adjacent sequences:  A076670 A076671 A076672 * A076674 A076675 A076676 KEYWORD nonn AUTHOR Zak Seidov, Oct 25 2002 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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.