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A323198
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Numbers k such that 457*2^k+1 is prime.
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0
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8, 28, 34, 70, 90, 158, 280, 320, 448, 1240, 3700, 6608, 7508, 23514, 34144, 74760, 118920, 131668, 353700, 863568, 915684
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refs;
listen;
history;
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internal format)
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OFFSET
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1,1
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LINKS
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Table of n, a(n) for n=1..21.
Ray Ballinger, Proth Search Page
Ray Ballinger and Wilfrid Keller, List of primes k.2^n + 1 for 300 < k < 600
Y. Gallot, Proth.exe: Windows Program for Finding Large Primes
Wilfrid Keller, List of primes k.2^n - 1 for k < 300
Eric Weisstein's World of Mathematics, Proth Prime
Index entries for sequences of n such that k*2^n-1 (or k*2^n+1) is prime
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MATHEMATICA
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Select[Range[1000], PrimeQ[457*2^# + 1] &]
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CROSSREFS
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Sequence in context: A184614 A006377 A319233 * A121739 A166729 A202290
Adjacent sequences: A323195 A323196 A323197 * A323199 A323200 A323201
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KEYWORD
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nonn,more,hard
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AUTHOR
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Robert Price, Jan 06 2019
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STATUS
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approved
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