A347691 a(n) = index of n in A308387, or -1 if n does not appear in A308387.

20, 1, 11, 10, 8, 3, 38, 5, 17, 4, 6, 19, 9, 16, 24, 14, 21, 27, 12, 2, 25, 36, 28, 15, 32, 43, 18, 23, 74, 33, 37, 39, 42, 29, 44, 22, 31, 46, 45, 56, 47, 52, 26, 48, 61, 60, 41, 49, 53, 73, 59, 13, 57, 91, 64, 40, 66, 62, 51, 7, 30, 58, 101, 55, 70, 69, 86, 34, 75, 65, 80, 78, 50

Offset: 1

Author

N. J. A. Sloane, Sep 26 2021

Keywords

• nonn

Examples

			A308387(20) = 1, so a(1) = 20.
		

Links

• N. J. A. Sloane, Table of n, a(n) for n = 1..6867

Crossrefs

Cf. A308387.