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A113767
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Values of the exponents in A084435.
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1
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0, 1, 2, 1, 5, 1, 1, 29, 3, 37, 31, 227, 835, 115, 7615, 6071, 218431
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OFFSET
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1,3
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COMMENTS
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If A084435 ever hits a Sierpinski number, the sequence is finite.
a(18) > 10^5. - Harsh R. Aggarwal, Apr 11 2018
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LINKS
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Table of n, a(n) for n=1..17.
Eric Weisstein. "Sierpinski Number of the Second Kind."
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PROG
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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: A323954 A143983 A282988 * A246964 A157334 A320667
Adjacent sequences: A113764 A113765 A113766 * A113768 A113769 A113770
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KEYWORD
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nonn,hard,more
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AUTHOR
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Ken Takusagawa, Jan 19 2006
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EXTENSIONS
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a(16)-a(17) from Harsh R. Aggarwal, Apr 11 2018
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STATUS
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approved
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