A054430 - OEIS

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A054430

Simple self-inverse permutation of natural numbers: List each clump of phi(n) numbers (starting from phi(2) = 1) in reverse order.

1, 3, 2, 5, 4, 9, 8, 7, 6, 11, 10, 17, 16, 15, 14, 13, 12, 21, 20, 19, 18, 27, 26, 25, 24, 23, 22, 31, 30, 29, 28, 41, 40, 39, 38, 37, 36, 35, 34, 33, 32, 45, 44, 43, 42, 57, 56, 55, 54, 53, 52, 51, 50, 49, 48, 47, 46, 63, 62, 61, 60, 59, 58, 71, 70, 69, 68, 67, 66, 65, 64, 79 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	LINKS	`Index entries for sequences that are permutations of the natural numbers`
	MAPLE	`ReverseNextPhi_n_elements_permutation(30); with(numtheory, phi); ReverseNextPhi_n_elements_permutation := proc(u) local m, a, n, k, i; a := []; k := 0; for n from 2 to u do m := k + phi(n); for i from 1 to phi(n) do a := [op(a), m]; m := m-1; k := k+1; od; od; RETURN(a); end;`
	CROSSREFS	`Maps fractions between A020652/A020653 and A020653/A020652.` `See also A054429.` `Sequence in context: A169752 A095720 A115297 * A204891 A094681 A054158` `Adjacent sequences: A054427 A054428 A054429 * A054431 A054432 A054433`
	KEYWORD	`nonn,easy`
	AUTHOR	`Antti Karttunen`

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Last modified February 17 14:19 EST 2012. Contains 206038 sequences.