id:A156021 - OEIS Search Results

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Numbers n such that n^1+n^2+n^3+n^4-+1 are twin primes.

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1, 2, 12, 30, 44, 50, 63, 74, 110, 165, 177, 222, 239, 254, 327, 492, 519, 804, 942, 954, 1007, 1343, 1352, 1520, 1770, 2375, 2450, 2658, 2795, 2945, 2994, 3075, 3332, 3527, 3548, 3803, 3915, 3935, 4025, 4653, 4704, 4785, 4808, 4862, 5270, 5310, 5364, 5370 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`2+2^2=2^3+2^4-1=29;2+2^2=2^3+2^4+1=31, ...`
	MATHEMATICA	`lst={}; Do[p=(n^1+n^2+n^3+n^4); If[PrimeQ[p-1]&&PrimeQ[p+1], AppendTo[lst, n]], {n, 8!}]; lst`
	CROSSREFS	`Cf. A125964, A156018` `Sequence in context: A164876 A034318 A061780 this_sequence A067348 A002939 A118239` `Adjacent sequences: A156018 A156019 A156020 this_sequence A156022 A156023 A156024`
	KEYWORD	`nonn`
	AUTHOR	`Vladimir Orlovsky (4vladimir(AT)gmail.com), Feb 01 2009`

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

AT&T Labs Research