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The least prime factor of the numerator of Bernoulli(2*n), or 1 if the numerator is 1.
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1, 1, 1, 1, 1, 5, 691, 7, 3617, 43867, 283, 11, 103, 13, 7, 5, 37, 17, 26315271553053477373, 19, 137616929, 1520097643918070802691, 11, 23, 653, 5, 13, 39409, 7, 29, 2003, 31, 1226592271, 11, 17, 5, 3112655297839, 37, 19, 13, 631, 41, 233, 43, 11, 5, 23, 47, 7823741903
The prime factorization of abs(E(2k)) for k >= 2, E(k) the k-th Euler number. Factors sorted by size with the smallest factor negated. a(n) = -1 by convention for n = 1, 2.
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-1, -1, -5, -61, -5, 277, -19, 2659, -5, 13, 43, 967, -47, 4241723, -5, 17, 228135437, -79, 349, 87224971, -5, 5, 41737, 354957173, -31, 1567103, 1427513357, -5, 13, 2137, 111691689741601, -67, 61001082228255580483, -5, 19, 29, 71, 30211, 2717447, 77980901
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