Question

wap to generate number series of 1,2,4,7 up to 15 term.​

Answer 1

Answer:

need to generate a sequence such that its members contain only 1, 2, 3 digits. For example, 1 2 3 11 12 13 21 22 23 31 32 33 111 .... and so on up to 10^18th term.

1, 2, 3, 11, 12, 13, 21, 22, 23, 31, 32, 33, 111, 112, 113, 121, 122, 123, 131, 132, 133, 211, 212, 213, 221, 222, 223, 231, 232, 233, 311, 312, 313, 321, 322, 323, 331, 332, 333, 1111, 1112, 1113, 1121, 1122, 1123, 1131, 1132, 1133, 1211, 1212, 1213, 1221 ...

I expect to find the given n-th term in the series. It's a number system which contains only 1, 2, 3 or is combinations of these digits as a number as