Numbers n such that n-tau(n), phi(n) and n form a Heronian triangle, where tau=A000005 is the number of divisors and phi=A000010 the totient.
A268281
Numbers n such that n-tau(n), phi(n) and n form a Heronian triangle, where tau=A000005 is the number of divisors and phi=A000010 the totient.
Terms
- a(0) =5a(1) =34a(2) =53a(3) =90a(4) =120a(5) =440a(6) =780a(7) =1954a(8) =120994a(9) =140453a(10) =28813276834
External references
- oeis: A268281