login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A152084 Primes p such that p + 2^floor(log_2(p)) is prime. 1

%I

%S 3,7,11,31,41,47,67,73,103,109,127,149,179,239,251,307,313,331,337,

%T 397,421,463,487,521,557,617,641,659,701,719,809,887,911,941,947,971,

%U 977,1019,1039,1063,1087,1117,1129,1213,1249,1327,1399,1423,1453,1567,1597

%N Primes p such that p + 2^floor(log_2(p)) is prime.

%C a(n) + 2^floor(log_2(a(n))) = A152085(n).

%C If a(n) is written in binary and the leftmost 1 is replaced with "10", then we would have the binary representation of A152085(n), which is a prime.

%C Sequence A091932 contains the related primes p where p - 2^floor(log_2(p)) = prime.

%Y A152085, A091932

%K nonn

%O 1,1

%A _Leroy Quet_, Nov 23 2008

%E Extended by _Ray Chandler_, Nov 26 2008

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 April 18 06:48 EDT 2019. Contains 322209 sequences. (Running on oeis4.)