id:A084409 - OEIS Search Results

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Main diagonal of triangle A084408.

+0
4

1, 3, 11, 9, 29, 18, 59, 28, 40, 54, 107, 69, 179, 87, 106, 125, 271, 147, 389, 172, 200, 224, 541, 254, 286, 316, 346, 381, 727, 416, 941, 455, 495, 534, 575, 620, 1201, 665, 710, 756, 1493, 804, 1823, 856, 909, 962, 2203, 1018, 1077, 1136, 1194, 1254, 2621 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`a(n) is prime iff n is prime.`
	FORMULA	`For n prime, a(n) = p(A034387(n)). For n composite, a(n) = A002808([n*(n+1)/2]-A034387(n)-1).`
	CROSSREFS	`Cf. A084408, A084410, A084411.` `Adjacent sequences: A084406 A084407 A084408 this_sequence A084410 A084411 A084412` `Sequence in context: A126261 A050097 A070613 this_sequence A038229 A080351 A059200`
	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 21 00:02 EST 2008. Contains 150810 sequences.

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