id:A112823 - OEIS Search Results

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Greatest p less than or equal to n with p and q both prime, p+q = 2n.

+0
3

2, 3, 3, 5, 5, 7, 5, 7, 7, 11, 11, 13, 11, 13, 13, 17, 17, 19, 17, 19, 13, 23, 19, 19, 23, 23, 19, 29, 29, 31, 23, 29, 31, 29, 31, 37, 29, 37, 37, 41, 41, 43, 41, 43, 31, 47, 43, 37, 47, 43, 43, 53, 47, 43, 53, 53, 43, 59, 59, 61, 53, 59, 61, 59, 61, 67, 53, 67, 67, 71, 71, 73 (list; graph; listen)

	OFFSET	`2,1`
	MATHEMATICA	`f[n_] := Block[{p = n/2}, While[ !PrimeQ[p] \|\| !PrimeQ[n - p], p-- ]; p]; Table[ f[n], {n, 4, 146, 2}]`
	CROSSREFS	`Cf. A020481.` `Sequence in context: A023816 A010761 A093505 this_sequence A074399 A090302 A093074` `Adjacent sequences: A112820 A112821 A112822 this_sequence A112824 A112825 A112826`
	KEYWORD	`nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Sep 05 2005`

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Last modified July 23 17:35 EDT 2008. Contains 142285 sequences.

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