id:A086678 - OEIS Search Results

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Numbers n such that 1 + Sum_{k=1..n} 2k^5 is a prime.

+0
2

1, 2, 8, 9, 11, 20, 27, 36, 41, 42, 71, 77, 86, 95, 105, 110, 113, 132, 134, 137, 138, 147, 149, 155, 183, 186, 189, 201, 209, 210, 212, 215, 218, 222, 230, 245, 258, 261, 278, 309, 317, 329, 336, 341, 347, 359, 371, 377, 380, 389, 411, 413, 417, 425, 432, 435 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`(2n^6+6n^5+5*n^4-n^2+6)/6 is prime.`
	EXAMPLE	`Sum(k=1,2,2k^5)+1 = 21^5+22^5 + 1 = 67 is a prime so 2 belongs to the sequence.`
	CROSSREFS	`A091872 gives corresponding primes.` `Sequence in context: A116039 A030334 A020676 this_sequence A066550 A033950 A046526` `Adjacent sequences: A086675 A086676 A086677 this_sequence A086679 A086680 A086681`
	KEYWORD	`nonn,easy`
	AUTHOR	`Yalcin Aktar (matheux(AT)msn.com), Jul 28 2003`
	EXTENSIONS	`More terms from Ray Chandler (rayjchandler(AT)sbcglobal.net), Aug 07 2003`

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Last modified July 26 13:41 EDT 2008. Contains 142293 sequences.

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