A087677 Consider recurrence b(0) = n/3, b(n) = b(0)*floor(b(n-1)); sequence gives first integer reached, or -1 if no integer is ever reached.
2, 21, 240, 3, 10, 11, 4, 170195636, 84, 5, 736, 922709, 6, 38, 40, 7, 374, 10751097, 8, 550, 598, 9, 84, 87, 10, 1173908, 1371360, 11, 262696240, 203210, 12, 148, 152, 13, 72879280, 2419, 14, 588799, 44088, 15, 230, 235, 16, 4263, 20523050, 17, 5096, 5300, 18, 330, 336
Offset: 6
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