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A166458
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10n-(-1)^n is prime.
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0
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1, 2, 3, 6, 7, 8, 13, 14, 15, 18, 19, 20, 21, 24, 25, 27, 31, 33, 36, 38, 42, 43, 44, 48, 49, 50, 57, 60, 62, 63, 66, 69, 72, 74, 75, 81, 84, 86, 91, 92, 97, 99, 102, 103, 104, 105, 109, 115, 117, 123, 126, 128, 129, 132, 140, 144, 145, 146, 147, 150, 151, 153, 156, 157
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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EXAMPLE
| if 1*10-(-1)^1=11=prime, then a(1)=1; if 2*10-(-1)^2=19=prime, then a(2)=2; if 3*10-(-1)^3=31=prime, then a(3)=3; if 6*10-(-1)^6=59=prime, then a(4)=6.
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CROSSREFS
| Cf. A122869.
Sequence in context: A138683 A072426 A189137 * A189013 A127330 A035346
Adjacent sequences: A166455 A166456 A166457 * A166459 A166460 A166461
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KEYWORD
| nonn,easy
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AUTHOR
| Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Oct 14 2009
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EXTENSIONS
| Corrected (77 removed) by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), May 21 2010
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