id:A117499 - OEIS Search Results

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Number of subsets of {n-1, n, n+1} that sum up to a prime.

+0
2

3, 4, 4, 3, 2, 4, 2, 2, 2, 2, 2, 3, 1, 2, 2, 2, 1, 3, 2, 2, 2, 2, 2, 2, 0, 1, 1, 1, 2, 4, 2, 1, 1, 1, 1, 3, 2, 1, 1, 2, 2, 3, 1, 2, 1, 1, 1, 2, 1, 1, 2, 2, 2, 3, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2, 1, 2, 2, 2, 1, 2, 1, 2, 2, 1, 0, 2, 2, 1, 1, 2, 2, 2, 0, 1, 1, 1, 2, 3, 1, 0, 0, 0, 1, 3, 2, 2, 2, 2, 1, 2, 1, 1, 1 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`0 <= a(n) <= 4; a(A066388(n)) = 4.`
	FORMULA	`a(n) = A010051(n-1) + A010051(n) + A010051(n+1) + A010051(2n-1) + A010051(2n) + A010051(2*n+1).`
	EXAMPLE	`a(1) = #{2, 0+2=2, 2+2=3} = 3;` `a(2) = #{2, 3, 1+2=3, 2+3=5} = 4;` `a(3) = #{2, 3, 2+3=5, 3+4=7} = 4;` `a(4) = #{3, 5, 3+4=7} = 3;` `a(5) = #{5, 5+6=11} = 2.`
	CROSSREFS	`Adjacent sequences: A117496 A117497 A117498 this_sequence A117500 A117501 A117502` `Sequence in context: A073498 A105736 A090283 this_sequence A019917 A085005 A035004`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Mar 23 2006`

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Last modified October 13 17:46 EDT 2008. Contains 145008 sequences.

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