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A070155
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n-1, n+1 and 1+n^2 are prime numbers.
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6
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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; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Essentially the same as A129293. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jun 14 2008
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EXAMPLE
| n=150: 149,151 and 22501 are all primes
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MATHEMATICA
| Do[s=n; If[PrimeQ[s-1]&&PrimeQ[s+1]&&PrimeQ[1+s^2], Print[n]], {n, 1, 1000000}]
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CROSSREFS
| Cf. A001359, A006512, A014574, A002496, A005574, A070156.
Sequence in context: A052672 A137025 A176493 * A197882 A074124 A070156
Adjacent sequences: A070152 A070153 A070154 * A070156 A070157 A070158
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KEYWORD
| easy,nonn
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AUTHOR
| Labos E. (labos(AT)ana.sote.hu), Apr 23 2002
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