A377904 Index of 2*10^((10^n-1)/9) - 1 in A302656, or -1 if that number never appears there.

1, 14, 20, 97, 176, 396, 463, 1918, 1984, 2278

Offset

0,2

Comments

a(n) is the index in A302656 where we see 199...9, with k 9's, where k = 11...1 (with n 1's). For example, a(3) = 97 is where we see 199..9 with 111 9's.

It is extremely unlikely that -1 appears as a term in this sequence.

Based on Dominic McCarty's data in A302656.

Links

Table of n, a(n) for n=0..9.

Crossrefs

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

Sequence in context: A015797 A293184 A368408 * A064974 A167335 A129244

Adjacent sequences: A377901 A377902 A377903 * A377905 A377906 A377907

Keyword

nonn,more,new

Author

N. J. A. Sloane, Nov 19 2024

Status

approved