[seqfan] Absent digit

[Eric Angelini]

Hello SeqFans,
a simple but funny idea:
a(n) is part of S if the biggest digit NOT visible
in a(n) divides a(n).

S = 18,27,36,45,54,63,72,81,96,98,108,117,126,135,144,153,162,171,...

81 is in S because the biggest INVISIBLE digit in 81 [9] divides 81;
96 is in S because the biggest INVISIBLE digit in 96 [8] divides 96;
98 is in S because the biggest INVISIBLE digit in 98 [7] divides 98;
...

Best,
É.