id:A058871 - OEIS Search Results

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Sum of next n primes (A007468) is prime for odd n or half the sum is prime for even n.

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1, 3, 5, 7, 9, 13, 18, 20, 23, 25, 29, 48, 55, 98, 117, 119, 123, 130, 173, 187, 193, 198, 205, 213, 218, 223, 248, 249, 255, 259, 265, 268, 285, 292, 299, 311, 329, 346, 351, 386, 390, 393, 397, 411, 412, 448, 483, 487, 513, 515, 525, 554, 563, 574, 587, 597 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Do[ s = Sum[ Prime[i], {i, n(n-1)/2 + 1, n(n+1)/2} ]; If[ PrimeQ[s] \|\| PrimeQ[s/2], Print[n] ], {n, 1, 10^3} ]`
	CROSSREFS	`Cf. A007468.` `Sequence in context: A003543 A114513 A003524 this_sequence A121259 A089228 A126278` `Adjacent sequences: A058868 A058869 A058870 this_sequence A058872 A058873 A058874`
	KEYWORD	`nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 06 2001`

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Last modified September 5 01:44 EDT 2008. Contains 143476 sequences.

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