A026220 a(n) = (1/5)*s(n), where s(n) is the n-th multiple of 5 in A026177.

2, 1, 6, 8, 3, 4, 14, 5, 18, 20, 7, 24, 26, 9, 10, 32, 11, 12, 38, 13, 42, 44, 15, 16, 50, 17, 54, 56, 19, 60, 62, 21, 22, 68, 23, 72, 74, 25, 78, 80, 27, 28, 86, 29, 30, 92, 31, 96, 98, 33, 34, 104, 35, 36, 110, 37, 114, 116, 39, 40, 122, 41