48522699225domain: NAppears in sequencesDifference of consecutive primorial numbers divided by 4.at n=9A078865a(n) = denominator of 3*Sum_{j=0..n+1} 1/(2*j+1).at n=13A111877Denominator of partial sums of a series for 3*(Pi-3).at n=13A130412a(n) gives the denominators for A250031(n) as well as for A250032(n).at n=29A250033