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 A139500 Primes of the form x^2 + 20x*y + y^2 for x and y nonnegative. 1
 97, 157, 229, 577, 661, 709, 829, 1453, 1549, 1609, 1621, 1873, 2017, 2137, 2473, 2677, 2689, 2797, 2953, 3001, 3037, 3217, 3301, 3433, 3457, 3613, 3733, 4093, 4261, 4273, 4357, 4513, 4621, 4657, 4801, 4933, 5113, 5281, 5437, 5641, 6229, 6301, 6337 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS N. J. A. Sloane et al., Binary Quadratic Forms and OEIS (Index to related sequences, programs, references) MATHEMATICA a = {}; w = 20; k = 1; Do[Do[If[PrimeQ[n^2 + w*n*m + k*m^2], AppendTo[a, n^2 + w*n*m + k*m^2]], {n, m, 400}], {m, 1, 400}]; Union[a] (*Artur Jasinski*) CROSSREFS Cf. A139489, A007645, A068228, A007519, A033212, A033212, A107152, A107008, A033215, A107145, A139490, A139491. Sequence in context: A157213 A000923 A142528 * A261376 A142094 A142212 Adjacent sequences:  A139497 A139498 A139499 * A139501 A139502 A139503 KEYWORD nonn AUTHOR Artur Jasinski, Apr 24 2008 STATUS approved

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Last modified August 26 03:21 EDT 2019. Contains 326324 sequences. (Running on oeis4.)