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A093625
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Primes of the form (3^n+1)/2.
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2
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OFFSET
| 1,1
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COMMENTS
| Primes can only occur for n=2^k. The next term (if it exists) has k>=21 (i.e. more than 10^6 decimal digits). - Don Reble (djr(AT)nk.ca), Apr 28 2004. [For the latest results about the search, see A171381. - N. J. A. Sloane, Jun 14 2010]
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EXAMPLE
| a(3)=41 because it can be written as (3^4+1)/2=82/2.
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CROSSREFS
| A171381 is the main entry for this sequence. Cf. also A138083.
Sequence in context: A054859 A076725 A059917 * A042447 A176266 A075872
Adjacent sequences: A093622 A093623 A093624 * A093626 A093627 A093628
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KEYWORD
| nonn,hard
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AUTHOR
| Hugo Pfoertner (hugo(AT)pfoertner.org), Apr 19 2004
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EXTENSIONS
| Erroneous terms deleted by N. J. A. Sloane, Jun 14 2010
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