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Search: id:A099440
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| 11, 1013, 16369, 65519, 67108837, 1125899906842573, 72057594037927879, 1180591620717411303353, 83076749736557242056487941267521419
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OFFSET
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1,1
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COMMENT
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The next term a(10)=2^2072-2073 has 624 decimal digits.
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EXAMPLE
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a(2)=1013 because A000295(A099439(2))=2^10-10-1 is prime.
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MATHEMATICA
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lst={}; s=0; Do[s+=(n+=s); If[PrimeQ[Abs[s]], AppendTo[lst, s]], {n, 0, 6!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Oct 11 2008]
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CROSSREFS
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Cf. A000295 2^n-n-1 (column 2 of the Eulerian numbers), A099439 2^n-n-1 is prime, A099441 2^n-n-1 is a semiprime, A099442 semiprimes in A000295.
Sequence in context: A006938 A015511 A065050 this_sequence A069710 A046187 A004811
Adjacent sequences: A099437 A099438 A099439 this_sequence A099441 A099442 A099443
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KEYWORD
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nonn
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AUTHOR
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Hugo Pfoertner (hugo(AT)pfoertner.org), Oct 18 2004
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