GCD of divisor-sum of primorials and primorials itself: a(n) = gcd(A002110(n), A000203(A002110(n))).

A054641

GCD of divisor-sum of primorials and primorials itself: a(n) = gcd(A002110(n), A000203(A002110(n))).

Terms

    a(0) =1a(1) =6a(2) =6a(3) =6a(4) =6a(5) =42a(6) =42a(7) =210a(8) =210a(9) =210a(10) =210a(11) =3990a(12) =3990a(13) =43890a(14) =43890a(15) =43890a(16) =43890a(17) =1360590a(18) =23130030a(19) =23130030a(20) =855811110a(21) =855811110a(22) =855811110a(23) =855811110a(24) =855811110a(25) =855811110a(26) =11125544430a(27) =11125544430a(28) =11125544430a(29) =11125544430

External references