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 A230711 Values of y such that x^2 + y^2 = 5^n with x and y coprime and 0 < x < y. 7
 2, 4, 11, 24, 41, 117, 278, 527, 1199, 3116, 6469, 11753, 33802, 76443, 136762, 354144, 873121, 1721764, 3565918, 9653287, 20783558, 34867797, 103232189, 242017776, 451910159, 1064447283, 2726446322, 5583548873, 10513816601, 29729597084, 66349305331 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The corresponding x-values are in A230710. LINKS Zak Seidov, Table of n, a(n) for n = 1..200 Chris Busenhart, Lorenz Halbeisen, Norbert Hungerbühler, Oliver Riesen, On primitive solutions of the Diophantine equation x^2+ y^2= M, Eidgenössische Technische Hochschule (ETH Zürich, Switzerland, 2020). EXAMPLE a(4)=24 because 7^2+24^2=625=5^4. MATHEMATICA Table[Select[PowersRepresentations[5^n, 2, 2], CoprimeQ[#[[1]], #[[2]]] &][[1, 2]], {n, 33}] (* T. D. Noe, Nov 04 2013 *) CROSSREFS Cf. A000351, A188949, A230623, A230645, A230710. Sequence in context: A292157 A256801 A103669 * A034485 A018006 A183510 Adjacent sequences:  A230708 A230709 A230710 * A230712 A230713 A230714 KEYWORD nonn AUTHOR Colin Barker, Oct 28 2013 STATUS approved

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Last modified August 1 03:52 EDT 2021. Contains 346384 sequences. (Running on oeis4.)