a(n) is the least odd number k such that Omega(k) = n and Omega(k+2) = n+1, where Omega(k) is the number of prime factors of k (A001222).

A335498

a(n) is the least odd number k such that Omega(k) = n and Omega(k+2) = n+1, where Omega(k) is the number of prime factors of k (A001222).

Terms

    a(0) =1a(1) =7a(2) =25a(3) =873a(4) =1375a(5) =41875a(6) =903123a(7) =1015623a(8) =49671873a(9) =200921875a(10) =1157734375a(11) =41898828123a(12) =496308203125

External references