2,1

The uniqueness follows from generalization of Bertrand's Postulate. - Franklin T. Adams-Watters.

Table of n, a(n) for n=2..57.

Eric Weisstein's World of Mathematics, Bertrand's Postulate

Cf. A052248, A114349.

Sequence in context: A199536 A284883 A134333 * A102070 A026402 A036438

Adjacent sequences: A114328 A114329 A114330 * A114332 A114333 A114334

nonn,changed

N. J. A. Sloane, based on correspondence from Leroy Quet and Hugo Pfoertner, Feb 22 2006

approved