A026212 a(n) = (1/5)*s(n), where s(n) is the n-th multiple of 5 in A026172.

1, 3, 5, 2, 9, 11, 4, 15, 6, 7, 21, 23, 8, 27, 10, 33, 12, 13, 39, 41, 14, 45, 47, 16, 17, 51, 18, 19, 57, 59, 20, 63, 22, 69, 24, 25, 75, 77, 26, 81, 28, 29, 87, 30, 31, 93, 95, 32, 99, 101, 34, 35, 105, 36, 37, 111, 113, 38, 117, 40, 123