a(n) is the smallest number m such that gcd(tau(m), sigma(m), pod(m)) = n where tau(k) is the number of divisors of k (A000005), sigma(k) is the sum of divisors of k (A000203) and pod(k) is the product of divisors of k (A007955).

A337325

a(n) is the smallest number m such that gcd(tau(m), sigma(m), pod(m)) = n where tau(k) is the number of divisors of k (A000005), sigma(k) is the sum of divisors of k (A000203) and pod(k) is the product of divisors of k (A007955).

Terms

    a(0) =1a(1) =10a(2) =18a(3) =6a(4) =5000a(5) =90a(6) =66339a(7) =30a(8) =288a(9) =3240a(10) =10036224a(11) =60a(12) =582160384a(13) =20412a(14) =16200a(15) =168a(16) =49030215219a(17) =612a(18) =4637065216a(19) =1520a(20) =142884a(21) =912384a(23) =420a(24) =7543125a(25) =479232a(26) =14112a(27) =5824a(29) =104400a(31) =840a(32) =491774976

External references