Least number, m, such that m^2 is expressible in just n ways as (p+1)(q+1) where p and q are distinct primes.
A274877
Least number, m, such that m^2 is expressible in just n ways as (p+1)(q+1) where p and q are distinct primes.
Terms
- a(0) =1a(1) =6a(2) =18a(3) =12a(4) =24a(5) =60a(6) =156a(7) =84a(8) =144a(9) =120a(10) =816a(11) =336a(12) =360a(13) =1224a(14) =840a(15) =924a(16) =2184a(17) =1800a(18) =2640a(19) =7200a(20) =1260a(21) =3960a(22) =7140a(23) =8400a(24) =3780a(25) =5040a(26) =2520a(27) =9360a(28) =12600a(29) =20160
External references
- oeis: A274877