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

Author

Eric Chen, Dec 24 2014

Keywords

• sign

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)

Crossrefs

Cf. A053873, A053169.