Numbers k such that sopf(k) = 2*sopf(k+1), where sopf(k) = A008472.

Terms

a(0) =99a(1) =155a(2) =689a(3) =1106a(4) =1517a(5) =1524a(6) =3014a(7) =3403a(8) =3479a(9) =5809a(10) =6478a(11) =6723a(12) =8606a(13) =9143a(14) =9454a(15) =9797a(16) =10126a(17) =11771a(18) =12283a(19) =12382a(20) =13112a(21) =13969a(22) =14150a(23) =17422a(24) =19303a(25) =22184a(26) =24856a(27) =27466a(28) =28119a(29) =28529