A268675 - OEIS

A268675

Self-inverse permutation of natural numbers: a(1) = 1; a(n) = A000079(A193231(A007814(n))) * A250469(a(A268674(n))).

1, 2, 3, 8, 5, 6, 7, 4, 21, 10, 11, 24, 13, 14, 15, 32, 17, 42, 19, 40, 9, 22, 23, 12, 55, 26, 27, 56, 29, 30, 31, 16, 69, 34, 35, 168, 37, 38, 39, 20, 41, 18, 43, 88, 93, 46, 47, 96, 91, 110, 123, 104, 53, 54, 25, 28, 117, 58, 59, 120, 61, 62, 63, 64, 65, 138, 67, 136, 33, 70, 71, 84, 73, 74, 75, 152, 77, 78, 79, 160

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..1914

Index entries for sequences that are permutations of the natural numbers

FORMULA

a(1) = 1, and for n > 1, a(n) = A000079(A193231(A007814(n))) * A250469(a(A268674(n))).

Other identities. For all n >= 1:

A000035(a(n)) = A000035(n). [This permutation preserves the parity of n.]

A020639(a(n)) = A020639(n). [More generally, it preserves the smallest prime dividing n.]

A055396(a(n)) = A055396(n).