Least positive integer m with pi(m*n) = m + n, where pi(x) denotes the number of primes not exceeding x.
A247600
Least positive integer m with pi(m*n) = m + n, where pi(x) denotes the number of primes not exceeding x.
Terms
- a(0) =9a(1) =7a(2) =6a(3) =998a(4) =5a(5) =5a(6) =5a(7) =5a(8) =5a(9) =5a(10) =636787a(11) =1617099a(12) =4124188a(13) =10553076a(14) =5a(15) =5a(16) =179992154a(17) =465769460a(18) =1208198239a(19) =3140421185a(20) =5a(21) =5a(22) =5a(23) =145935688930a(24) =5a(25) =5a(26) =5a(27) =5a(28) =5a(29) =5
External references
- oeis: A247600