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 A256301 Least prime p such that p + k! is prime for all k = 2..n. 1
 2, 3, 5, 5, 17, 107, 107, 107, 107, 82954517, 82954517, 79017245897, 79017245897, 1490524895687, 13101487760627087 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The function f(k;p) = p+(k+1)! could be called an example of a non-polynomial prime generating function. LINKS Table of n, a(n) for n=1..15. Carlos Rivera, Puzzle 782. Prime-Generating non-polynomials, The Prime Puzzles & Problems Connection, April 4, 2015. PROG (PARI) a(n)=forprime(p=1, , for(i=2, n, ispseudoprime(p+i!)||next(2)); return(p)) CROSSREFS Sequence in context: A368706 A368674 A095296 * A226609 A157260 A336017 Adjacent sequences: A256298 A256299 A256300 * A256302 A256303 A256304 KEYWORD nonn,more AUTHOR M. F. Hasler, Apr 05 2015 EXTENSIONS a(12)-a(14) from John Cerkan, Jul 28 2017 Erroneous a(12) deleted and new a(14) from Khalid Sabry, Jan 25 2020 a(15) from Giovanni Resta, Jan 28 2020 STATUS approved

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Last modified February 21 03:13 EST 2024. Contains 370219 sequences. (Running on oeis4.)