Primes having only {1, 4, 6} as digits.

Terms

a(0) =11a(1) =41a(2) =61a(3) =461a(4) =641a(5) =661a(6) =4111a(7) =4441a(8) =6661a(9) =11161a(10) =11411a(11) =14411a(12) =14461a(13) =16111a(14) =16141a(15) =16411a(16) =16661a(17) =41141a(18) =41161a(19) =41411a(20) =41611a(21) =41641a(22) =44111a(23) =44641a(24) =46141a(25) =46411a(26) =46441a(27) =61141a(28) =61441a(29) =64661