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:
...factorial(n) plus/minus 1 is semiprime
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2020-09-01, 17:13
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Dylan14
"Dylan"
Mar 2017
2×281 Posts
This would be the intersection of
078778
(n such that n!+1 is semiprime) and
078781
(n such that n!-1 is semiprime). There is no separate sequence (yet, as far as I can tell).
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