id:A054430 - OEIS Search Results

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

+0
2

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; listen)

	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: A143527 A095720 A115297 this_sequence A094681 A054158 A054080` `Adjacent sequences: A054427 A054428 A054429 this_sequence A054431 A054432 A054433`
	KEYWORD	`nonn,easy`
	AUTHOR	`Antti Karttunen`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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