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A109758
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Numbers k such that (10's complement factorial of k) - 1 is semiprime.
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0
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5, 6, 10, 13, 20, 22, 23, 24, 27, 29, 33, 40, 41, 43, 46, 51, 54, 79, 80, 83, 85, 93, 106, 111
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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COMMENTS
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Sequence possibly continues with 112, 137, 145, 148, 163, 165, 177, 190, 196, 197. 206 is the next certain term. - Tyler Busby, Feb 09 2023
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LINKS
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CROSSREFS
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KEYWORD
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more,nonn,base
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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