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 A243186 Nonnegative integers of the form x^2 + 6xy - 5y^2. 2
 0, 1, 2, 4, 8, 9, 11, 16, 18, 22, 25, 32, 35, 36, 43, 44, 49, 50, 64, 65, 67, 70, 72, 81, 86, 88, 91, 98, 99, 100, 107, 113, 121, 128, 130, 134, 137, 140, 144, 155, 162, 163, 169, 172, 176, 179, 182, 193, 196, 198, 200 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Discriminant 56. Nonnegative integers of the form 2x^2 - 7y^2. - Jon E. Schoenfield, Jun 03 2022 LINKS Table of n, a(n) for n=1..51. N. J. A. Sloane et al., Binary Quadratic Forms and OEIS (Index to related sequences, programs, references) MATHEMATICA Reap[For[n = 0, n <= 200, n++, If[Reduce[1*x^2 + 6*x*y - 5*y^2 == n, {x, y}, Integers] =!= False, Sow[n]]]][[2, 1]] CROSSREFS Primes: A141190. Sequence in context: A010071 A035271 A338047 * A326673 A297126 A044814 Adjacent sequences: A243183 A243184 A243185 * A243187 A243188 A243189 KEYWORD nonn AUTHOR N. J. A. Sloane, Jun 05 2014 STATUS approved

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Last modified June 10 17:16 EDT 2023. Contains 363206 sequences. (Running on oeis4.)