Multiples of 6 with only prime digits (2, 3, 5 and 7).

Terms

a(0) =72a(1) =222a(2) =252a(3) =372a(4) =522a(5) =552a(6) =732a(7) =2232a(8) =2322a(9) =2352a(10) =2532a(11) =2772a(12) =3222a(13) =3252a(14) =3372a(15) =3522a(16) =3552a(17) =3732a(18) =5232a(19) =5322a(20) =5352a(21) =5532a(22) =5772a(23) =7272a(24) =7332a(25) =7572a(26) =7722a(27) =7752a(28) =22272a(29) =22332