id:A057458 - OEIS Search Results

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Number of k, 1 <= k <= n, where {k (n+1-k) + 1} is prime.

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1, 2, 1, 4, 0, 6, 3, 2, 2, 8, 1, 12, 2, 2, 4, 16, 2, 10, 5, 2, 8, 14, 2, 14, 2, 8, 9, 16, 0, 20, 11, 4, 4, 14, 2, 18, 16, 8, 7, 28, 2, 32, 6, 6, 10, 24, 5, 14, 14, 8, 21, 42, 0, 22, 8, 14, 12, 22, 4, 24, 18, 14, 20, 14, 2, 44, 14, 14, 10, 34, 5, 46, 20, 4, 18, 38, 4, 38, 15, 10, 16, 46, 2 (list; graph; listen)

	OFFSET	`1,2`
	LINKS	`Leroy Quet, Home Page (listed in lieu of email address)`
	EXAMPLE	`For n = 7, 26 + 1, 44 + 1 and 6*2 + 1 are prime, so a(7) = 3.`
	CROSSREFS	`Sequence in context: A033883 A106316 A126707 this_sequence A011017 A077954 A077979` `Adjacent sequences: A057455 A057456 A057457 this_sequence A057459 A057460 A057461`
	KEYWORD	`nonn`
	AUTHOR	`Leroy Quet Sep 26 2000`

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

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