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 A035243 Positive numbers of the form x^2+xy+5y^2 (discriminant -19). 2
 1, 4, 5, 7, 9, 11, 16, 17, 19, 20, 23, 25, 28, 35, 36, 43, 44, 45, 47, 49, 55, 61, 63, 64, 68, 73, 76, 77, 80, 81, 83, 85, 92, 95, 99, 100, 101, 112, 115, 119, 121, 125, 131, 133, 137, 139, 140, 144, 149, 153, 157, 161, 163, 169, 171, 172, 175, 176, 180, 187, 188, 191, 196, 197, 199, 207, 209, 215, 220, 225, 229, 233, 235, 239, 244, 245, 251, 252, 253, 256 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Indices of nonzero terms in expansion of Dirichlet series Product_p (1-(Kronecker(m,p)+1)*p^(-s)+Kronecker(m,p)*p^(-2s))^(-1) for m= -19 (A035171). [amended by Georg Fischer, Sep 03 2020] LINKS PROG (PARI) m=-19; select(x -> x, direuler(p=2, 101, 1/(1-(kronecker(m, p)*(X-X^2))-X)), 1) \\ Fixed by Andrey Zabolotskiy, Sep 03 2020 CROSSREFS Cf. A035171. For primes see A106863. Sequence in context: A050560 A204664 A283554 * A035255 A341787 A335984 Adjacent sequences:  A035240 A035241 A035242 * A035244 A035245 A035246 KEYWORD nonn AUTHOR EXTENSIONS Edited by N. J. A. Sloane, Jun 01 2014 STATUS approved

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Last modified July 24 20:26 EDT 2021. Contains 346273 sequences. (Running on oeis4.)