Numbers in A007504 such that omega(a(n)) = Omega(a(n)) = 4.

Terms

a(0) =5830a(1) =6870a(2) =13490a(3) =16401a(4) =58406a(5) =60146a(6) =61910a(7) =65534a(8) =75130a(9) =136114a(10) =148827a(11) =153178a(12) =213538a(13) =257358a(14) =269074a(15) =273054a(16) =327198a(17) =354102a(18) =377310a(19) =382038a(20) =403611a(21) =443685a(22) =475323a(23) =488774a(24) =496905a(25) =665130a(26) =684510a(27) =691026a(28) =799846a(29) =817563