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A156021 Numbers n such that n^1+n^2+n^3+n^4-+1 are twin primes. 2
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; refs; listen; history; internal format)
OFFSET

1,2

COMMENTS

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 * A067348 A002939 A118239

Adjacent sequences:  A156018 A156019 A156020 * A156022 A156023 A156024

KEYWORD

nonn

AUTHOR

Vladimir Orlovsky (4vladimir(AT)gmail.com), Feb 01 2009

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Last modified February 14 18:33 EST 2012. Contains 205663 sequences.