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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A295111 Primes p such that 2^p - p is also a prime. 0
 2, 3, 13, 19, 481801 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS a(6) > 1061095. Intersection of A000040 and A048744. Since numbers other than 3 that are congruent to 3 mod 6 are composite, for n > 2, a(n) is congruent to 1 mod 6 (see comments by Iain Fox in A048744). LINKS EXAMPLE p=13, 2^13 - 13 = 8179 is prime. PROG (PARI) lista(nn) = forprime(p=2, nn, if(ispseudoprime(2^p - p), print1(p, ", "))) CROSSREFS Cf. A000325, A081296, A048744, A057663, A057673. Sequence in context: A234366 A084958 A249573 * A229117 A295722 A037392 Adjacent sequences:  A295108 A295109 A295110 * A295112 A295113 A295114 KEYWORD hard,more,nonn AUTHOR Iain Fox, Nov 14 2017 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 June 29 14:08 EDT 2022. Contains 354913 sequences. (Running on oeis4.)