id:A055265 - OEIS Search Results

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Smallest positive integer not already in sequence with a(n)+a(n-1) prime.

+0
7

1, 2, 3, 4, 7, 6, 5, 8, 9, 10, 13, 16, 15, 14, 17, 12, 11, 18, 19, 22, 21, 20, 23, 24, 29, 30, 31, 28, 25, 34, 27, 26, 33, 38, 35, 32, 39, 40, 43, 36, 37, 42, 41, 48, 49, 52, 45, 44, 53, 50, 47, 54, 55, 46, 51, 56, 57, 70, 61, 66, 65, 62, 69, 58, 73, 64, 63, 68, 59, 72, 67, 60 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Inverse permutation: A117922; fixed points: A117925; A117923=a(a(n)). - Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Apr 03 2006`
	LINKS	`T. D. Noe, Table of n, a(n) for n=1..1000` `Index entries for sequences that are permutations of the natural numbers`
	EXAMPLE	`a(5)=7 because 1, 2, 3 and 4 have already been used and neither 4+5=9 nor 4+6=10 are prime while 4+7=11 is prime.`
	CROSSREFS	`Cf. A036440, A051237, A051239, A055266, A088643.` `Sequence in context: A072275 A122989 A077223 this_sequence A117922 A073666 A092842` `Adjacent sequences: A055262 A055263 A055264 this_sequence A055266 A055267 A055268`
	KEYWORD	`easy,nice,nonn`
	AUTHOR	`Henry Bottomley (se16(AT)btinternet.com), May 09 2000`
	EXTENSIONS	`Corrected by Hans Havermann (pxp(AT)rogers.com), Sep 24 2002`

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Last modified July 26 13:41 EDT 2008. Contains 142293 sequences.

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