Least positive integer m with pi(m*n) = phi(m+n), where pi(.) is the prime-counting function and phi(.) is Euler's totient function.
A247602
Least positive integer m with pi(m*n) = phi(m+n), where pi(.) is the prime-counting function and phi(.) is Euler's totient function.
Terms
- a(0) =3a(1) =2a(2) =1a(3) =91a(4) =6a(5) =5a(6) =1a(7) =5a(8) =1a(9) =8041a(10) =15870a(11) =39865a(12) =1a(13) =251625a(14) =637064a(15) =1829661a(16) =4124240a(17) =10553093a(18) =1a(19) =69709253a(20) =179992156a(21) =465769749a(22) =1210576800a(23) =3140421235a(24) =13974959892
External references
- oeis: A247602