Harmonic numbers m with a record number k of distinct prime numbers p_i (i = 1..k) that do not divide m such that m*p_1, m*p_1*p_2, ... , m*p_1*...*p_k are all harmonic numbers.
A335370
Harmonic numbers m with a record number k of distinct prime numbers p_i (i = 1..k) that do not divide m such that m*p_1, m*p_1*p_2, ... , m*p_1*...*p_k are all harmonic numbers.
Terms
- a(0) =1a(1) =28a(2) =1638a(3) =6200a(4) =2457000a(5) =4713984a(6) =1381161600a(7) =10200236032
External references
- oeis: A335370