Harmonic numbers k with a record number of primes p not dividing k such that k*p is also a harmonic number.
A335368
Harmonic numbers k with a record number of primes p not dividing k such that k*p is also a harmonic number.
Terms
- a(0) =1a(1) =28a(2) =1638a(3) =30240a(4) =2178540a(5) =2457000a(6) =32997888a(7) =142990848a(8) =1307124000a(9) =71271827200a(10) =547929930240
External references
- oeis: A335368