A210771 Inverse permutation to A210770.

1, 2, 4, 6, 3, 8, 5, 10, 12, 7, 14, 16, 18, 9, 20, 22, 11, 24, 26, 13, 28, 30, 15, 32, 17, 34, 36, 19, 38, 40, 21, 42, 44, 23, 46, 48, 25, 50, 52, 27, 54, 56, 29, 58, 60, 31, 62, 64, 66, 33, 68, 70, 35, 72, 74, 37, 76, 78, 39, 80, 82, 41, 84, 86, 43, 88, 90

Offset: 1

Author

Reinhard Zumkeller, Mar 25 2012

Keywords

• nonn

Links

• Reinhard Zumkeller, Table of n, a(n) for n = 1..10000
• Index entries for sequences that are permutations of the natural numbers

Programs

Haskell

import Data.List (elemIndex)
import Data.Maybe (fromJust)
a210771 n = fromJust (elemIndex n a210770_list) + 1