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 A166339 Numbers n such that Sum(n!/k!),k=0..n is prime. 0
 1, 2, 2016, 3226, 8130 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS No further terms up to n=20000. The sequence a[n]=Sum(n!/k!),k=0..n is A000522. LINKS FORMULA n is an index of the sequence a[n]=Sum(n!/k!),k=0..n such that a[n] is prime. EXAMPLE For n=2, a=5 which is a prime. PROG (PARI) a=1; for(n=1, 20000, a=n*a+1; if(ispseudoprime(a, 0), print("n="n))); CROSSREFS Cf. A000522 (corresponding sequence). Sequence in context: A177188 A125635 A124361 * A024034 A101722 A004908 Adjacent sequences:  A166336 A166337 A166338 * A166340 A166341 A166342 KEYWORD nonn AUTHOR Mike Oakes, Oct 12 2009 STATUS approved

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Last modified May 16 10:43 EDT 2022. Contains 353700 sequences. (Running on oeis4.)