A089651 Partial sums of the sequence : a(1)=1, a(1), a(1), a(1), a(1), a(2), a(2), a(2), a(2), a(3), a(3), a(3), a(3), a(4), ...each terms (not a(1)) repeated 4 times.

1, 2, 3, 4, 5, 7, 9, 11, 13, 16, 19, 22, 25, 29, 33, 37, 41, 46, 51, 56, 61, 68, 75, 82, 89, 98, 107, 116, 125, 136, 147, 158, 169, 182, 195, 208, 221, 237, 253, 269, 285, 304, 323, 342, 361, 383, 405, 427, 449, 474, 499, 524, 549, 578, 607, 636, 665