Numbers k such that both A381019(k) and A381019(k+1) are composite.

Terms

a(0) =63a(1) =630a(2) =2423a(3) =5653a(4) =9104a(5) =26308a(6) =36108a(7) =41622a(8) =64526a(9) =85121a(10) =108917a(11) =143913a(12) =148305a(13) =176405a(14) =316974a(15) =399168a(16) =399907a(17) =406487a(18) =536926a(19) =621016a(20) =830793a(21) =937038a(22) =937109a(23) =970243a(24) =1088629a(25) =1480545a(26) =1895503a(27) =3961587a(28) =4651102a(29) =5171081