A366702 Numbers k such that 12^k + 1 is a semiprime.
2, 4, 5, 11, 16, 32, 109, 128, 193
Offset: 1
Examples
11 is in this sequence because 12^11+1 = 13*57154490053 is a semiprime.
This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
11 is in this sequence because 12^11+1 = 13*57154490053 is a semiprime.