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A198387 Common differences in triples of squares in arithmetic progression. 11
24, 96, 120, 216, 240, 384, 336, 480, 600, 840, 864, 960, 840, 1176, 720, 1080, 1536, 1344, 1944, 1920, 2160, 2400, 1320, 2520, 2904, 2016, 3360, 3456, 3000, 3696, 4056, 3840, 3024, 3360, 2184, 4704, 2880, 4320, 5280, 5400, 6144, 5544, 6000, 6936, 6240, 5880 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
Reinhard Zumkeller, Table of initial values
FORMULA
a(n) = A198385(n) - A198384(n) = A198386(n) - A198385(n).
A198438(n) = a(A198409(n)).
MATHEMATICA
wmax = 1000;
triples[w_] := Reap[Module[{u, v}, For[u = 1, u < w, u++, If[IntegerQ[v = Sqrt[(u^2 + w^2)/2]], Sow[{u^2, v^2, w^2}]]]]][[2]];
#[[2]] - #[[1]]& /@ Flatten[DeleteCases[triples /@ Range[wmax], {}] , 2] (* Jean-François Alcover, Oct 21 2021 *)
PROG
(Haskell)
a198387 n = a198387_list !! (n-1)
a198387_list = zipWith (-) a198385_list a198384_list
CROSSREFS
Sequence in context: A208984 A103251 A256418 * A057102 A057103 A055669
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Oct 24 2011
STATUS
approved

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Last modified June 13 05:35 EDT 2024. Contains 373366 sequences. (Running on oeis4.)