Denominator of Sum_{p prime, p-1 divides n} 1/p.

Terms

a(0) =2a(1) =6a(2) =2a(3) =30a(4) =2a(5) =42a(6) =2a(7) =30a(8) =2a(9) =66a(10) =2a(11) =2730a(12) =2a(13) =6a(14) =2a(15) =510a(16) =2a(17) =798a(18) =2a(19) =330a(20) =2a(21) =138a(22) =2a(23) =2730a(24) =2a(25) =6a(26) =2a(27) =870a(28) =2a(29) =14322