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%I A032454 #32 Dec 23 2024 11:36:58
%S A032454 1,7,17,23,29,31,41,261,353,437,447,591,649,677,1253,1301,2449,9313,
%T A032454 11749,16661,25173,32887,38761,67973,79557,149423,173833,298679,
%U A032454 336951,684887,1199689,2357111,2602213,4687127
%N A032454 Numbers k such that 155*2^k+1 is prime.
%H A032454 Ray Ballinger, <a href="http://www.prothsearch.com/index.html">Proth Search Page</a>
%H A032454 Ray Ballinger and Wilfrid Keller, <a href="http://www.prothsearch.com/riesel1.html">List of primes k.2^n + 1 for k < 300</a>
%H A032454 <a href="/index/Pri#riesel">Index entries for sequences of n such that k*2^n-1 (or k*2^n+1) is prime</a>
%t A032454 Select[Range[1000], PrimeQ[155*2^# + 1] & ] (* _Robert Price_, Dec 18 2018 *)
%o A032454 (PARI) is(n)=ispseudoprime(155*2^n+1) \\ _Charles R Greathouse IV_, Jun 13 2017
%K A032454 nonn,hard,more
%O A032454 1,2
%A A032454 _N. J. A. Sloane_
%E A032454 Extended by _Hugo Pfoertner_, Jul 02 2003
%E A032454 a(27)-a(31) from the Ray Ballinger and Wilfrid Keller link by _Robert Price_, Dec 18 2018
%E A032454 a(32)-a(33) from _Jeppe Stig Nielsen_, Mar 12 2020
%E A032454 a(34) from _Jeppe Stig Nielsen_, Dec 23 2024

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