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⇱ The On-Line Encyclopedia of Integer Sequences (OEIS)

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Showing entries 1-10 | older changes
Numbers k such that both (k!)^2 + k! + 1 and (k!)^2 + 1 are prime.
#18 by Michael De Vlieger at Tue Nov 11 21:30:50 EST 2025
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#17 by Jason Yuen at Tue Nov 11 20:08:35 EST 2025
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#16 by Jason Yuen at Tue Nov 11 20:08:25 EST 2025
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KEYWORD
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#15 by Michael De Vlieger at Tue Aug 12 17:32:32 EDT 2025
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#14 by Giovanni Resta at Tue Aug 12 16:08:43 EDT 2025
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#13 by Giovanni Resta at Tue Aug 12 16:08:02 EDT 2025
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FORMULA
CROSSREFS
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#12 by Alois P. Heinz at Tue Aug 12 12:43:47 EDT 2025
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#11 by Alois P. Heinz at Tue Aug 12 12:43:34 EDT 2025
CROSSREFS
#10 by Alois P. Heinz at Tue Aug 12 12:43:04 EDT 2025
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#9 by Robert Israel at Tue Aug 12 12:37:00 EDT 2025
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