A057947 n has ambiguous representations in "bad hexadecimal": numbers with the digit 1 followed by a digit less than 6.
10, 11, 12, 13, 14, 15, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146
Offset: 0
Examples
a(5)=15 is on the list as this could be taken to represent 15*16^0=15 or 1*16^1+5*16^0=21
Crossrefs
Cf. A057946.