Numbers k such that k and k+1 both have the prime signature (2,1,1,1) (A189982).

Terms

a(0) =11780a(1) =20349a(2) =24794a(3) =33579a(4) =36764a(5) =37323a(6) =38324a(7) =38675a(8) =38709a(9) =42020a(10) =44505a(11) =47564a(12) =47684a(13) =51204a(14) =52155a(15) =53955a(16) =55419a(17) =56259a(18) =64844a(19) =68475a(20) =71379a(21) =71994a(22) =75284a(23) =77714a(24) =79134a(25) =80475a(26) =81548a(27) =81549a(28) =83420a(29) =85491