If n is composite replace n with the concatenation of its nontrivial divisors [ A037279 ] then divide out any factors of 2.
A037280
If n is composite replace n with the concatenation of its nontrivial divisors [ A037279 ] then divide out any factors of 2.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =1a(4) =5a(5) =23a(6) =7a(7) =3a(8) =3a(9) =25a(10) =11a(11) =1173a(12) =13a(13) =27a(14) =35a(15) =31a(16) =17a(17) =2369a(18) =19a(19) =12255a(20) =37a(21) =211a(22) =23a(23) =586703a(24) =5a(25) =213a(26) =39a(27) =12357a(28) =29a(29) =23561015
External references
- oeis: A037280