Numbers k where records occur for sigma(k)/sigma(k+1), where sigma(k) is the sum of divisors of k (A000203).

A335068

Numbers k where records occur for sigma(k)/sigma(k+1), where sigma(k) is the sum of divisors of k (A000203).

Terms

    a(0) =1a(1) =2a(2) =4a(3) =6a(4) =12a(5) =30a(6) =36a(7) =60a(8) =180a(9) =240a(10) =420a(11) =840a(12) =1680a(13) =2520a(14) =5040a(15) =7560a(16) =12600a(17) =15120a(18) =30240a(19) =55440a(20) =110880a(21) =221760a(22) =332640a(23) =665280a(24) =720720a(25) =1441440a(26) =2882880a(27) =3603600a(28) =4324320a(29) =10810800

External references