A304532 Inverse of A304531.

1, 2, 4, 6, 11, 3, 42, 20, 8, 12, 237, 5, 1798, 43, 14, 96, 7192, 9, 69611, 16, 45, 238, 431203, 21, 32, 1799, 25, 47, 2401568, 13

Offset: 1

Author

Antti Karttunen, May 14 2018

Keywords

• nonn
• hard
• more

Comments

This is the left inverse of A304531, and also the right inverse if A304531 indeed is a permutation of natural numbers.

Crossrefs

Cf. A304531 (inverse).

Cf. also A303752.

Programs

PARI

\\ Use the program given in A304531.

Formula

For all n >= 1, a(A304531(n)) = n.