A050001 a(n)=position of n in A050000.

1, 5, 2, 4, 19, 6, 16, 26, 3, 18, 23, 28, 10, 15, 20, 25, 61, 7, 12, 35, 17, 22, 76, 27, 45, 130, 9, 14, 135, 37, 73, 91, 24, 60, 127, 29, 47, 65, 11, 34, 52, 70, 88, 478, 21, 75, 124, 93, 359, 44, 62, 129, 594, 8, 49, 116, 13, 134, 506, 36, 54, 431, 72, 90, 139, 480, 41, 59

Offset: 1

Author

Clark Kimberling

Keywords

• nonn
• easy

Comments

Inverse permutation to A050000: a(A050000(n)) = A050000(a(n)) = n.

Links

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

Crossrefs

a(n) = k <=> A050000(k) = n.

Programs

Haskell

import Data.List (elemIndex)
import Data.Maybe (fromJust)
a050001 n = (fromJust $ elemIndex n a050000_list) + 1
-- Reinhard Zumkeller, Nov 13 2011

Extensions

More terms from Ray Chandler, Nov 16 2003