A047975 - OEIS

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|.

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