Increasingly larger bases required for composite numbers to become prime by base reversal (A075243).

A074901

Increasingly larger bases required for composite numbers to become prime by base reversal (A075243).

Terms

    a(0) =0a(1) =2a(2) =4a(3) =6a(4) =8a(5) =9a(6) =12a(7) =26a(8) =27a(9) =34a(10) =38a(11) =48a(12) =54a(13) =60a(14) =96a(15) =150a(16) =168a(17) =180a(18) =420a(19) =438a(20) =462a(21) =468a(22) =522a(23) =540a(24) =570a(25) =828a(26) =1320a(27) =1782a(28) =2130a(29) =2142

External references