1,2

Antti Karttunen, Table of n, a(n) for n = 1..10000

Index entries for sequences that are permutations of the natural numbers

a(n) = A268674(A269379(n)).

Other identities. For all n >= 1:

a(2n) = 2n. [Fixes the even numbers.]

For n=9 we first find what number is below 9 in square array A255127, which is 19, then we find what number is above 19 in square array A083221, which is 17, thus a(9) = 17.

(Scheme) (define (A269356 n) (A268674 (A269379 n)))

Inverse: A269355.

Cf. A268674, A269379.

Cf. also arrays A083221 & A255127.

More recursed variant: A269358. Cf. also permutations A266646, A255408, A269172.

Sequence in context: A032943 A273735 A257735 * A269358 A115309 A171722

Adjacent sequences: A269353 A269354 A269355 * A269357 A269358 A269359

nonn

Antti Karttunen, Mar 03 2016

approved