|
| |
|
|
A097444
|
|
Second occurrence where n# + p is prime for primes p = 3,5,...
|
|
1
| |
|
|
7, 13, 41, 227, 2339, 30059, 510551, 9699727, 223092917, 6469693319, 200560490213, 7420738134911, 304250263527317, 13082761331670097, 614889782588491519, 32589158477190044803, 1922760350154212639159
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 2,1
|
|
|
COMMENTS
| Care has to be taken to start with a large enough n to be sure terms are not missed. Here we used n=100.
|
|
|
FORMULA
| n# is n primorial = product of primes 2*3*5*...*p<=n
|
|
|
EXAMPLE
| 5# = 2*3*5 = 30. 30+7 = 37 first prime,30+11 = 41 second prime.
|
|
|
PROG
| (PARI) primorp2(n) = { pr=1; for(x=1, n, f=1; pr*=prime(x); for(m=1, n, y=pr+prime(m); if(isprime(y), f=1; for(m=m+1, n, y=pr+prime(m); if(isprime(y), print1(y", "); f=0; break, f=1)); ); if(f==0, break) ) ) }
|
|
|
CROSSREFS
| Sequence in context: A107207 A045464 A134854 * A151781 A047977 A139403
Adjacent sequences: A097441 A097442 A097443 * A097445 A097446 A097447
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| Cino Hilliard (hillcino368(AT)gmail.com), Aug 23 2004
|
| |
|
|
