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

0,2

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.

Links

Table of n, a(n) for n=0..20.

Crossrefs

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

Sequence in context: A323978 A219390 A050585 * A050555 A060669 A166644

Adjacent sequences: A377903 A377904 A377905 * A377907 A377908 A377909

Keyword

nonn,more,new

Author

N. J. A. Sloane, Nov 22 2024

Status

approved