A353727 Index in A353715 of the first term divisible by 2^n and no higher power of 2, or -1 if no such term exists.
0, 2, 3, 11, 54, 74, 88, 183, 20334, 30938, 21247, 90575, 3913, 124845, 2643790, 5828721, 2469947, 4005550, 19917707
Offset: 0
Examples
Table showing initial values of n (column 1) and a(n) (column 3). The central column shows the corresponding entry of A353715 written in base 2. The entries in column 2 end in exactly n zeros. n A353715(a(n)) a(n) 0 1 0 1 110 2 2 1100 3 3 1101000 11 4 11110000 54 5 1111100000 74 6 11101000000 88 7 110110000000 183 8 1111110101100000000 20334 9 10111110101000000000 30938 10 1111111110000000000 21247 11 1001111111100000000000 90575 12 11111000000000000 3913 13 10011111110000000000000 124845 14 111110111110100000000000000 2643790 15 10011111111111000000000000000 5828721 16 111111111110000000000000000 2469947 17 1111111101100000000000000000 4005550 18 1011111111111000000000000000000 19917707