A115012 Sum_{i=1..n, gcd(5,i)=1} i.
1, 3, 6, 10, 10, 16, 23, 31, 40, 40, 51, 63, 76, 90, 90, 106, 123, 141, 160, 160, 181, 203, 226, 250, 250, 276, 303, 331, 360, 360, 391, 423, 456, 490, 490, 526, 563, 601, 640, 640, 681, 723, 766, 810, 810, 856, 903, 951, 1000, 1000, 1051, 1103, 1156, 1210, 1210, 1266
Offset: 1