A141748 a(n) = n-th nonnegative integer k such that there is a unique nonnegative integer pair (i,j) for which n = 2^i + 3^j.
2, 3, 4, 7, 9, 10, 13, 19, 25, 28, 29, 31, 33, 41, 43, 59, 65, 67, 73, 82, 83, 85, 89, 91, 97, 113, 129, 131, 137, 145, 155, 209, 244, 245, 247, 251, 257, 265, 275, 283, 307, 337, 371, 499, 513, 515, 521, 539, 593, 730, 731, 733, 737, 745, 755, 761, 793, 857, 985
Offset: 1
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