A250221 Least k such that A_n(k) = n, or -1 if no such k exists.

1, 2, 11, -1, 16, 12, -1, 9, -1, 11, -1, -1, -1, 11, -1, 8, -1, -1, 126, -1, -1, -1, -1, -1, -1, 26, 27, -1, -1, -1, -1, -1, -1, -1, -1, 29, 31, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 33, -1, -1, -1, -1, -1, -1, 19, -1, -1, 45, -1, -1, -1, -1, -1, -1, 35, -1, -1, 8

Offset

1,2

Comments

a(A053169(n)) = -1, but what is a(53169)?

a(319) is the first unknown term. (See A000319)

a(241) should be -1. (See A000241)

Links

Table of n, a(n) for n=1..72.

Crossrefs

Cf. A053873, A053169.

Sequence in context: A326042 A350035 A353877 * A365610 A298444 A224480

Adjacent sequences: A250218 A250219 A250220 * A250222 A250223 A250224

Keyword

sign

Author

Eric Chen, Dec 24 2014

Status

approved