Let p*q = A006881(n) be the n-th number that is the product of two distinct primes, with p = prime(i), q=prime(j); a(n) = p^j - q^i.
A176885
Let p*q = A006881(n) be the n-th number that is the product of two distinct primes, with p = prime(i), q=prime(j); a(n) = p^j - q^i.
Terms
- a(0) =1a(1) =3a(2) =9a(3) =2a(4) =32a(5) =21a(6) =51a(7) =122a(8) =111a(9) =282a(10) =237a(11) =560a(12) =489a(13) =1898a(14) =1794a(15) =6200a(16) =995a(17) =2017a(18) =13428a(19) =19154a(20) =4059a(21) =2166a(22) =8151a(23) =73212a(24) =16341a(25) =58208a(26) =89088a(27) =176186a(28) =32721a(29) =383766
External references
- oeis: A176885