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

A335067

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

Terms

    a(0) =1a(1) =179a(2) =239a(3) =359a(4) =719a(5) =839a(6) =1259a(7) =3359a(8) =5039a(9) =10079a(10) =25199a(11) =27719a(12) =50399a(13) =55439a(14) =110879a(15) =166319a(16) =360359a(17) =665279a(18) =831599a(19) =1081079a(20) =1441439a(21) =2162159a(22) =3603599a(23) =4324319a(24) =12972959a(25) =21621599a(26) =43243199a(27) =61261199a(28) =73513439a(29) =122522399

External references