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A322946
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Numbers k such that 311*2^k+1 is prime.
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0
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9, 29, 35, 105, 125, 131, 179, 359, 2735, 28199, 47349, 64485, 1094135, 1171199, 1323071, 2798459
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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..16.
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[311*2^# + 1] &] (* Robert Price, Dec 31 2018 *)
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CROSSREFS
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Cf. A002255, A050527.
Sequence in context: A044976 A002642 A032700 * A350963 A098949 A031296
Adjacent sequences: A322943 A322944 A322945 * A322947 A322948 A322949
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KEYWORD
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nonn,more,hard
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AUTHOR
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Robert Price, Dec 31 2018
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EXTENSIONS
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a(16) from Jeppe Stig Nielsen, Dec 27 2019
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STATUS
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approved
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