A350620 a(n) = smallest k such that A350877(k) = n, or -1 if n does not appear in A350877.

1, 7, 2, 6, 71, 3, 25, 5, 22, 70, 30, 13, 345, 24, 27, 16, 161, 21, 148, 69, 32, 29, 51, 43, 1154, 344, 161336, 23, 34, 26, 48, 737, 156, 160, 36, 77534485877, 63, 147, 38, 68, 234, 31, 40, 28, 53, 50, 126, 42, 639, 1153, 58, 343, 73, 161335, 88, 111, 108, 33, 135, 614667, 192, 47, 65, 736, 60, 155, 454, 159, 186, 35, 97, 77534485876, 78, 62, 2340, 146, 143, 37, 24841, 67, 476, 233, 433, 10579, 140, 39, 359, 169, 85, 52, 80, 49, 195, 125, 166, 41, 17282073747557

Offset

1,2

Links

Martin Ehrenstein, Table of n, a(n) for n = 1..126

Crossrefs

Cf. A350877. See A350621 for where the primes appear.

Sequence in context: A073330 A208852 A248284 * A195404 A225146 A021583

Adjacent sequences: A350617 A350618 A350619 * A350621 A350622 A350623

Keyword

nonn

Author

N. J. A. Sloane, Jan 23 2022.

Extensions

a(27) was found by Keith F. Lynch, and a(36) and a(72) by Russ Cox.

a(97) and a(115) were found by Martin Ehrenstein using Kim Walisch's primesieve package.

More than the usual number of terms are shown in order to give all the terms up to the extreme value a(97).

Status

approved