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Search: id:A070155
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| A070155 |
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n-1, n+1 and 1+n^2 are prime numbers. |
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+0
7
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| 4, 6, 150, 180, 240, 270, 420, 570, 1290, 1320, 2310, 2550, 2730, 3360, 3390, 4260, 4650, 5850, 5880, 6360, 6780, 9000, 9240, 9630, 10530, 10890, 11970, 13680, 13830, 14010, 14550, 16230, 16650, 18060, 18120, 18540, 19140, 19380, 21600, 21840
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Essentially the same as A129293. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jun 14 2008
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EXAMPLE
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n=150: 149,151 and 22501 are all primes
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MATHEMATICA
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Do[s=n; If[PrimeQ[s-1]&&PrimeQ[s+1]&&PrimeQ[1+s^2], Print[n]], {n, 1, 1000000}]
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CROSSREFS
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Cf. A001359, A006512, A014574, A002496, A005574, A070156.
Sequence in context: A013165 A052672 A137025 this_sequence A074124 A070156 A081970
Adjacent sequences: A070152 A070153 A070154 this_sequence A070156 A070157 A070158
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KEYWORD
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easy,nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Apr 23 2002
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