Numbers whose digits are prime and which retain this property when multiplied by some 1-digit prime (i.e., one of 2, 3, 5 or 7).
A227922
Numbers whose digits are prime and which retain this property when multiplied by some 1-digit prime (i.e., one of 2, 3, 5 or 7).
Terms
- a(0) =5a(1) =7a(2) =25a(3) =55a(4) =75a(5) =325a(6) =555a(7) =755a(8) =775a(9) =2525a(10) =2575a(11) =3225a(12) =3325a(13) =5325a(14) =5555a(15) =7525a(16) =7555a(17) =7575a(18) =7775a(19) =25775a(20) =32225a(21) =33225a(22) =33325a(23) =53225a(24) =53325a(25) =55555a(26) =75325a(27) =75555a(28) =75775a(29) =77525
External references
- oeis: A227922