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A192764 Numbers k such that 2^(k-1)+2*k-1 is a prime number. 1
1, 2, 6, 14, 66, 86, 230, 2006, 3876, 3920, 5418, 8820, 11900, 16669, 19446, 28243, 33408, 37919, 40595 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
MATHEMATICA
Select[Range[4000], PrimeQ[2^(# - 1) + 2# - 1] &] (* Alonso del Arte, Jul 09 2011 *)
PROG
(PARI) for(n=1, 10^6, if(ispseudoprime(2^(n-1)+2*n-1), print1(n, ", ")));
CROSSREFS
Sequence in context: A324365 A346208 A354533 * A055691 A072171 A371008
KEYWORD
nonn,more
AUTHOR
EXTENSIONS
a(13)-a(19) from Michael S. Branicky, Jul 14 2023
STATUS
approved

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Last modified April 20 16:19 EDT 2024. Contains 371844 sequences. (Running on oeis4.)