a(n) is the smallest number k larger than a(n-1) such that n*d(k)*sopf(k)=sigma(k), where d is the number of divisors (A000005) and sopf the sum of prime factors without repetition (A008472).

A134382

a(n) is the smallest number k larger than a(n-1) such that n*d(k)*sopf(k)=sigma(k), where d is the number of divisors (A000005) and sopf the sum of prime factors without repetition (A008472).

Terms

    a(0) =20a(1) =140a(2) =464a(3) =660a(4) =1276a(5) =1365a(6) =2204a(7) =2508a(8) =2805a(9) =2907a(10) =5590a(11) =5698a(12) =5742a(13) =6006a(14) =7395a(15) =8680a(16) =14645a(17) =15052a(18) =18875a(19) =19170a(20) =19740a(21) =23871a(22) =34579a(23) =34804a(24) =35164a(25) =35244a(26) =35934a(27) =38121a(28) =106805a(29) =114953

External references