A381231 Index of first occurrence of -n in A000319, or -1 if -n never appears there.

6, 3, 4, 5, 48, 15642, 14, 87, 924, 23, 1074, 1066, 14524, 7051, 15000, 71709, 57604, 57554, 2056626, 2036049, 16068, 86, 934, 37142, 57439, 72635, 57342, 1394559, 358329, 2112076, 16941, 2015018, 57124, 27572, 1837444, 29, 2058540, 54694, 2075246, 359870, 76579, 7844, 61424, 55065, 61434, 2016279, 71877, 2271483, 305269, 57405, 1842679

Offset

0,1

Comments

If a(53) is not -1, then a(53) > 7366318. - Tim Peters, Mar 04 2025

Links

Tim Peters, Table of n, a(n) for n = 0..52

Crossrefs

Cf. A000319, A381230.

Sequence in context: A365066 A198110 A377962 * A290795 A197577 A363688

Adjacent sequences: A381228 A381229 A381230 * A381232 A381233 A381240

Keyword

nonn,new

Author

N. J. A. Sloane, Feb 28 2025

Extensions

a(5)-a(17) from Hugo Pfoertner, Feb 28 2025

a(18)-a(50) from Tim Peters, Mar 01 2025

Status

approved