1,1

n^2+n+55661 is the first or second most efficient formula for finding primes until we get to n^2+n+154001 (competitors are n^2+n+41, n^2+n+55661, n^2+n+41537, n^2+n+27941, n^2+n+21377, ...)

Table of n, a(n) for n=1..33.

Cf. A005846.

Sequence in context: A217692 A061740 A184094 * A251778 A203866 A205093

Adjacent sequences: A116203 A116204 A116205 * A116207 A116208 A116209

nonn

Douglas Winston (douglas.winston(AT)srupc.com), Apr 14 2007

approved