A031304 Position of n-th 5 in A031298.
5, 20, 40, 60, 80, 91, 93, 95, 97, 99, 100, 101, 103, 105, 107, 109, 120, 140, 160, 180, 205, 235, 265, 295, 325, 341, 344, 347, 350, 353, 355, 356, 359, 362, 365, 368, 385, 415, 445, 475, 505, 535, 565, 595, 625, 641, 644, 647
Offset: 1