1,1

Table of n, a(n) for n=1..75.

165 = 3*5*11, an odd number of prime divisors; the middle one is 5, so a(165) = 5. 315 = 3*3*5*7, an even number of prime divisors; the middle two are 3 and 5; their mean is 4, so a(315) = 4.

Cf. A088836 (first difference at 2n+1 = 45).

Sequence in context: A130140 A051417 A090368 * A088836 A076565 A286517

Adjacent sequences: A120371 A120372 A120373 * A120375 A120376 A120377

nonn

Franklin T. Adams-Watters, Jun 27 2006

approved