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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A273807 Primes of the form 2^(2^n) + 427. 1
431, 443, 683, 65963, 4294967723 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Terms given correspond to n = 1, 2, 3, 4 and 5.

Next term >= 2^2^27 + 427. - Charles R Greathouse IV, Jun 07 2016

LINKS

Table of n, a(n) for n=1..5.

MATHEMATICA

Select[Table[2^(2^n) + 427, {n, 0, 15}], PrimeQ]

PROG

(MAGMA) [a: n in [0..16] | IsPrime(a) where a is 2^(2^n)+427];

(PARI) for(n=1, 5, if(ispseudoprime(t=2^2^n+427), print1(t", "))) \\ Charles R Greathouse IV, Jun 07 2016

CROSSREFS

Cf. similar sequences listed in A273547.

Sequence in context: A208627 A176387 A160518 * A323047 A046018 A142802

Adjacent sequences:  A273804 A273805 A273806 * A273808 A273809 A273810

KEYWORD

nonn

AUTHOR

Vincenzo Librandi, Jun 02 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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified September 21 21:32 EDT 2021. Contains 347605 sequences. (Running on oeis4.)