A181578 The number k such that each of the five factorials (5k+j)!, j=0..4, has exactly n trailing zeros in its base-10 representation; 0 if no such k exists.
0, 1, 2, 3, 4, 0, 5, 6, 7, 8, 9, 0, 10, 11, 12, 13, 14, 0, 15, 16, 17, 18, 19, 0, 20, 21, 22, 23, 24, 0, 0, 25, 26, 27, 28, 29, 0, 30, 31, 32, 33, 34, 0, 35, 36, 37, 38, 39, 0, 40, 41, 42, 43, 44, 0, 45, 46, 47, 48, 49, 0, 0, 50, 51, 52, 53, 54, 0, 55, 56, 57, 58, 59, 0, 60, 61, 62, 63
Offset: 0
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