id:A084410 - OEIS Search Results

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First column of triangle A084408.

+0
4

1, 2, 5, 4, 13, 10, 31, 20, 30, 42, 61, 55, 109, 70, 88, 108, 181, 126, 277, 148, 174, 201, 397, 225, 255, 287, 318, 348, 547, 382, 733, 417, 456, 496, 535, 576, 947, 621, 666, 711, 1213, 758, 1499, 805, 858, 910, 1831, 963, 1020, 1078, 1137, 1195, 2207, 1255 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`a(n) is prime iff n is prime.`
	FORMULA	`For n prime, a(n) = p(A034387(n)-n+1). For n composite, a(n) = A002808([n*(n+1)/2]-A034387(n)-n).`
	CROSSREFS	`Cf. A084408, A084409, A084411.` `Sequence in context: A121274 A111681 A073122 this_sequence A080067 A117824 A122212` `Adjacent sequences: A084407 A084408 A084409 this_sequence A084411 A084412 A084413`
	KEYWORD	`nonn,easy`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jun 01 2003`
	EXTENSIONS	`Edited and extended by David Wasserman (wasserma(AT)spawar.navy.mil), Dec 27 2004`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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