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

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A124684 (Product of successive primes minus 2) divided by 5 is prime. 0
229, 1153, 14149, 15013, 189733, 214657, 253573, 350593, 514561, 522289, 725041, 853669, 1304581, 1453681, 2027569, 2183281, 2212453, 2469637, 3238513, 4166017, 4331941, 4467013, 5234689, 5510371, 5992933, 6102913, 8100097, 8130673 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
These numbers times 5 also form simiprimes.
LINKS
EXAMPLE
31*37 = 1147, 1147-2 = 1145, 1145/5 = 229 the second entry.
PROG
(PARI) g(n, p) = { for(x=1, n, y=prime(x)*prime(x+1)-2; if(y%p==0, if(isprime(y/p), print1(y/p", ")))) }
CROSSREFS
Cf. A123921.
Sequence in context: A142608 A210514 A142665 * A332740 A178673 A028452
KEYWORD
easy,nonn
AUTHOR
Cino Hilliard, Dec 27 2006
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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 28 09:04 EDT 2024. Contains 371240 sequences. (Running on oeis4.)