Least integer m such that there are exactly n quadruples of distinct divisors (d_i, d_j, d_k, d_l) among the divisors of m having the property d_i * d_j - d_k * d_l = 1, for some i, j, k, l.
A306427
Least integer m such that there are exactly n quadruples of distinct divisors (d_i, d_j, d_k, d_l) among the divisors of m having the property d_i * d_j - d_k * d_l = 1, for some i, j, k, l.
Terms
- a(0) =28a(1) =84a(2) =120a(3) =240a(4) =360a(5) =252a(6) =210a(7) =660a(8) =1008a(9) =1848a(10) =630a(11) =1320a(12) =420a(13) =2310a(14) =840a(15) =4830a(16) =1680a(17) =3360a(18) =5880a(19) =11700a(20) =1980a(21) =4200a(22) =1260a(23) =9660a(24) =3960a(25) =3780a(26) =2520a(27) =6930a(28) =4620a(29) =8190
External references
- oeis: A306427