Ramanujan's ternary quadratic form

the quadratic form x²+y²+10z² over the integers, about which it is conjectured that the only odd integers not of that form are 3, 7, 21, 31, 33, 43, 67, 79, 87, 133, 217, 219, 223, 253, 307, 391, 679, and 2719

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