A020642 n-th composite is sum of first k composites for some k.
1, 5, 10, 17, 33, 44, 56, 69, 82, 99, 116, 134, 175, 196, 242, 267, 321, 349, 377, 408, 442, 475, 507, 542, 581, 619, 659, 700, 741, 785, 966, 1015, 1065, 1111, 1167, 1273, 1329, 1383, 1563, 1622, 1687, 1751, 1949, 2017, 2084, 2159, 2231, 2302, 2375, 2449, 2685
Offset: 1