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A176680
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Sequence of primes that are both of the type 2^n-3 and 3*m-2.
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0
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OFFSET
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1,1
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COMMENTS
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Solve[2^n - 3 == 3*m - 4, m];
gives m=(1+2^n)/3.
When that m is an Integer and 2^n-3 is Prime both conditions are met
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LINKS
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Table of n, a(n) for n=1..4.
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MATHEMATICA
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Flatten[Table[If[IntegerQ[Rationalize[N[ (1 + 2^n)/ 3]]] && PrimeQ[2^n - 3], 2^n - 3, {}], {n, 2, 100000}]]
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CROSSREFS
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Sequence in context: A198054 A202758 A197962 * A069142 A144994 A072880
Adjacent sequences: A176677 A176678 A176679 * A176681 A176682 A176683
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KEYWORD
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nonn,uned
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AUTHOR
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Roger L. Bagula, Apr 23 2010
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STATUS
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approved
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