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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A047975 Let (p1,p2), (p3,p4) be two pairs of successive primes such that p1*p2=p3+p4-1, |p2-p1|=|p4-p3|; sequence gives |p2-p1|=|p4-p3|. 0
 2, 4, 2, 4, 6, 6, 4, 2, 4, 4, 2, 6, 4, 6, 4, 4, 6, 4, 2, 2, 4, 2, 4, 6, 6, 10, 8, 4, 4, 4, 2, 4, 4, 2, 6, 6, 4, 2, 8, 6, 12, 2, 2, 8, 10, 2, 12, 6, 4, 4, 14, 2, 18, 16, 6, 10, 4, 8, 4, 2, 8, 12, 2, 8, 12, 10, 6, 2, 6 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS Table of n, a(n) for n=0..68. EXAMPLE E.g 5*7=17+19-1,(7-5=19-17=2); 7*11=37+41-1,(11-7=41-37=4); 11*13=71+73-1,(13-11=73-71=2); 13*17=109+113-1,(17-13=113-109=4);... CROSSREFS Sequence in context: A143271 A267654 A128859 * A112791 A227346 A296141 Adjacent sequences: A047972 A047973 A047974 * A047976 A047977 A047978 KEYWORD nonn AUTHOR Naohiro Nomoto 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 July 18 09:18 EDT 2024. Contains 374378 sequences. (Running on oeis4.)