a(n) = gcd(Sum_{k=1..n} prime(k), Product{j=1..n} prime(j)).

Terms

a(0) =2a(1) =1a(2) =10a(3) =1a(4) =14a(5) =1a(6) =2a(7) =77a(8) =10a(9) =3a(10) =10a(11) =1a(12) =238a(13) =1a(14) =82a(15) =3a(16) =110a(17) =3a(18) =2a(19) =213a(20) =2a(21) =7a(22) =874a(23) =3a(24) =530a(25) =129a(26) =158a(27) =3a(28) =370a(29) =177