The OEIS is supported by the many generous donors to the OEIS Foundation.

 Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 59th year, we have over 358,000 sequences, and we’ve crossed 10,300 citations (which often say “discovered thanks to the OEIS”). Other ways to Give
 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A273809 Primes of the form 2^(2^n) + 487. 1
 491, 503, 743, 4294967783, 115792089237316195423570985008687907853269984665640564039457584007913129640423 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Terms given correspond to n = 1, 2, 3, 5 and 8. Next term >= 2^2^35 + 487. - Charles R Greathouse IV, Jun 07 2016 LINKS MATHEMATICA Select[Table[2^(2^n) + 487, {n, 0, 15}], PrimeQ] PROG (Magma) [a: n in [0..16] | IsPrime(a) where a is 2^(2^n)+487]; (PARI) for(n=0, 8, if(ispseudoprime(t=2^2^n+357), print1(t", "))) \\ Charles R Greathouse IV, Jun 07 2016 CROSSREFS Cf. similar sequences listed in A273547. Sequence in context: A056936 A056052 A051115 * A060975 A180457 A271664 Adjacent sequences: A273806 A273807 A273808 * A273810 A273811 A273812 KEYWORD nonn AUTHOR Vincenzo Librandi, Jun 03 2016 STATUS approved

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

Last modified December 7 17:25 EST 2022. Contains 358668 sequences. (Running on oeis4.)