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A196940
Primes of the form 15*2^n - 1.
2
29, 59, 239, 479, 15359, 245759, 1966079, 32212254719, 32985348833279, 141670994486089356410879, 18133887294219437620592639, 72535549176877750482370559, 1246151246048358630847319119012823039, 638029437976759618993827388934565396479
OFFSET
1,1
COMMENTS
Primes in A196305.
LINKS
MATHEMATICA
Select[Table[15 2^n - 1, {n, 1, 300}], PrimeQ] (* Vincenzo Librandi, Feb 23 2014 *)
PROG
(PARI) for(n=1, 1e3, if(ispseudoprime(t=15<<n-1), print1(t", "))) \\ Charles R Greathouse IV, Oct 08 2011
(Magma) [a: n in [1..130] | IsPrime(a) where a is 15*2^n-1]; // Vincenzo Librandi, Feb 23 2014
CROSSREFS
Cf. A002237 (n such that 15*2^n-1 is prime).
Sequence in context: A060229 A326897 A139507 * A104119 A356717 A042674
KEYWORD
nonn
AUTHOR
Brad Clardy, Oct 07 2011
STATUS
approved