A281900 Index of first occurrence of n in A281579, or -1 if n does not appear there..

1, 3, 6, 7, 15, 16, 34, 240, 241, 317, 502, 503, 504, 505, 1077, 1178, 1179, 1806, 4866, 4901, 4902, 4946, 4947, 8195, 8196, 8197, 8198, 8199, 8200, 8201, 8202, 8203, 8204, 45393, 45485, 45486, 96358, 96359, 96360, 96361, 96362, 96363, 96364, 96365, 96366

Offset

2,2

Comments

The sequence is strictly increasing.

It is conjectured that every number >= 2 does appear in A281579.

a(n) is also the index of the first occurrence of n-1 in A380317, or -1 if n-1 does not appear there.

Links

Rémy Sigrist, Table of n, a(n) for n = 2..1904 (a(2)-a(968) added on Feb 01 2017, a(969)-a(1904) added on Feb 06 2017)

Rémy Sigrist, C++ program for A281900

Crossrefs

Cf. A281579, A310387.

Sequence in context: A341622 A139247 A124611 * A266615 A043305 A227723

Adjacent sequences: A281897 A281898 A281899 * A281901 A281902 A281903

Keyword

nonn

Author

Rémy Sigrist, Feb 01 2017

Extensions

Escape clause added to definition by N. J. A. Sloane, Feb 17 2025

Status

approved