A377906 Index of 10^n in A302656, or -1 if 10^n does not appear in A302656.

1, 12, 16, 56, 93, 136, 168, 321, 332, 363, 409, 411, 443, 467, 1658, 1688, 1699, 1708, 1715, 1720, 1913

Offset: 0

Author

N. J. A. Sloane, Nov 22 2024

Keywords

• nonn
• more

Comments

Also the indices of the 1's in A376769.

A term 10^n in A302656 is the trigger for an astronomically-sized term 2*10^{n 1's} - 1 later. For example, a(4) = 93 leads to the term A302656(176) = 2*10^1111 - 1 (cf. A377903, A377904).

a(0) through a(19) based on Dominic McCarty's data in A302656.

The initial 21 terms form three groups of sizes 7, 7, and at least 7. It would be nice to know more terms.

Crossrefs

Summary: the 16 sequences derived from A302656 are A376769-A376776, A377903-A377904, A377906-A377911.