200550domain: NAppears in sequencesa(n) is smallest positive integer, distinct from any terms earlier in the sequence, such that (sum{k=1 to n}[a(k)]) divides (product{k=1 to n}[a(k)])*(sum{k=1 to n}[1/a(k)]).at n=7A05833030-gonal pyramidal numbers: a(n) = n*(n+1)*(28*n-25)/6.at n=35A256650