id:A089750 - OEIS Search Results

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a(n) = the first prime in the orbit of n under f(n) = n + the first prime > n, or 0 if no such prime exists.

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3, 2, 3, 43, 5, 13, 7, 19, 43, 379, 11, 113, 13, 31, 18749, 2341, 17, 37, 19, 43, 379, 788941, 23, 53, 113, 241, 511213, 4089763, 29, 61, 31, 18749, 2341, 71, 601, 73, 37, 79, 163, 331, 41, 353, 43, 379, 788941 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Question: Is a(n) > 0 for all n? I do not have a value for a(46).`
	EXAMPLE	`4 -> 4 + (first prime > 4) = 4 + 5 = 9 -> 9 + 11 = 20 -> 20 + 23 = 43 (prime). So a(4) = 43.`
	CROSSREFS	`Sequence in context: A091806 A139170 A139075 this_sequence A109591 A118064 A070471` `Adjacent sequences: A089747 A089748 A089749 this_sequence A089751 A089752 A089753`
	KEYWORD	`nonn`
	AUTHOR	`Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Jan 08 2004`

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Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.

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