The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A281483 Numbers k such that 32771*2^k + 1 is prime. 0
 1, 13, 19, 29, 37, 45, 51, 61, 63, 65, 69, 117, 171, 181, 199, 201, 217, 221, 265, 337, 627, 631, 881, 1035, 1507, 1525, 1627, 1641, 2037, 3175, 4639, 6445, 21537, 29801, 30521, 30917, 37877, 49725, 50877, 57537, 61337, 118141, 125169, 200961, 204117, 283445, 395125, 829489 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS a(48) = 829489, 1438879 is such that 32771*2^1438879 + 1 is prime with 433151 digits, 829489 < a(49) <= 1438879. LINKS MATHEMATICA Select[Range@ 3000, PrimeQ[32771*2^# + 1] &] (* Michael De Vlieger, Jan 23 2017 *) PROG (PFGW) 32771*2^\$a+1 \$a: from 1 to 1000001 step 2 (PARI) list(limit)=my(i=1); while(i

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified May 18 05:01 EDT 2021. Contains 343994 sequences. (Running on oeis4.)