Irregular triangle read by rows in which row n lists the proper divisors of n (those divisors of n which are < n), with the first row {1} by convention.

A027751

Irregular triangle read by rows in which row n lists the proper divisors of n (those divisors of n which are < n), with the first row {1} by convention.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =1a(6) =1a(7) =2a(8) =3a(9) =1a(10) =1a(11) =2a(12) =4a(13) =1a(14) =3a(15) =1a(16) =2a(17) =5a(18) =1a(19) =1a(20) =2a(21) =3a(22) =4a(23) =6a(24) =1a(25) =1a(26) =2a(27) =7a(28) =1a(29) =3

External references