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A366702
Numbers k such that 12^k + 1 is a semiprime.
0
2, 4, 5, 11, 16, 32, 109, 128, 193
OFFSET
1,1
EXAMPLE
11 is in this sequence because 12^11+1 = 13*57154490053 is a semiprime.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Sean A. Irvine, Oct 16 2023
STATUS
approved