A027917 a(n) = least k such that 1+2+...+k >= E{1,2,...,n}, where E is the 3rd elementary symmetric function.
3, 10, 21, 38, 63, 95, 137, 191, 256, 334, 427, 535, 661, 805, 968, 1151, 1357, 1585, 1838, 2117, 2422, 2755, 3117, 3510, 3934, 4392, 4883, 5409, 5973, 6574, 7213, 7894, 8615, 9379, 10187, 11041, 11940, 12887, 13883, 14929, 16026, 17176, 18379, 19637, 20952, 22323, 23754, 25244, 26795, 28408
Offset: 3