OFFSET
1,2
COMMENTS
Prime divisors are counted with multiplicity.
If "2" were a cluster point of this sequence it would follow that there are infinitely many twin primes.
PROG
(PARI) a(n) = my(P=prod(k=1, n, prime(k))); bigomega(P+1) + bigomega(P-1); \\ Michel Marcus, Mar 07 2022
CROSSREFS
KEYWORD
hard,nonn
AUTHOR
Arne Ring (arne.ring(AT)epost.de), Aug 01 2000
EXTENSIONS
a(36)-a(81) from Charles R Greathouse IV, May 07 2011
STATUS
approved