1,1
No more primes up to 21-st recurrence step [From Artur Jasinski (grafix(AT)csl.pl), Sep 20 2008]
Andersen's calculations show that A000058(24) is the first number whose primality is unknown.
Jens Kruse Andersen, Factorization of Sylvester's sequence
Eric Weisstein's World of Mathematics, Further information
a = {}; k = 2; Do[k = k^2 - k + 1; If[PrimeQ[k], AppendTo[a, k]], {n, 1, 15}]; a [From Artur Jasinski (grafix(AT)csl.pl), Sep 20 2008]
Cf. A000058.
Sequence in context: A075442 A082993 A071580 * A068393 A032053 A086542
Adjacent sequences: A014543 A014544 A014545 * A014547 A014548 A014549
nonn
Eric Weisstein (eric(AT)weisstein.com)
