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Search: id:A113767
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| 0, 1, 2, 1, 5, 1, 1, 29, 3, 37, 31, 227, 835, 115, 7615
(list; graph; listen)
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OFFSET
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1,3
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COMMENT
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If A084435 ever hits a Sierpinski number, the sequence is finite.
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LINKS
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Eric Weisstein. "Sierpinski Number of the Second Kind."
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PROGRAM
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(PARI) a=2; for(x=1, 16, for(k=0, 1000000, p=2^k*a+1; if(isprime(p), print(k); break)); a=p)
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CROSSREFS
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Cf. A084435, A113334, A121799.
Sequence in context: A078036 A066421 A143983 this_sequence A132601 A047818 A055972
Adjacent sequences: A113764 A113765 A113766 this_sequence A113768 A113769 A113770
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KEYWORD
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hard,nonn
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AUTHOR
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Ken Takusagawa (kenta(AT)cs.stanford.edu), Jan 19 2006
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