OFFSET
1,2
COMMENTS
Except for a(1) and a(2), the same as A070971. It appears that a(2n)=2a(n) for odd n. Because the primorial numbers (A002110) yield record values of the Jacobsthal function, we have a(A048670(n))=A002110(n). Note that numbers in this sequence up to n=18 have the form p#, p#/2, p#/q, or p#/(2q), where p and q are primes with 2<q<p and p# denotes the product of the primes up to p.
CROSSREFS
KEYWORD
nonn
AUTHOR
T. D. Noe, Mar 28 2007
EXTENSIONS
a(19) onwards from Don Reble, Oct 17 2013
STATUS
approved