1280537domain: NPropertiesPrimalityPrimeyesAppears in sequencesa(n) = (1/2)*s(n+3), where s = A025248.at n=17A025249Expansion of (1 - x - sqrt(1 - 2*x + x^2 - 8*x^3)) / (4*x^2) in powers of x.at n=19A091565Numerator(Bernoulli(2n)) mod denominator(Bernoulli(2n)).at n=18A169980Prime numbersat n=98642