1,2

Cf. A064517 pi(n) is a square, A064523 pi(n^2) is a square, A000720 pi(n), the number of primes <= n.

Sqrt@PrimePi[{ * list of entries in A064523 *) }^2] - Robert G. Wilson v (rgwv(at)rgwv.com), Feb 03 2006

Cf. A000720, A064517, A064523.

Sequence in context: A033090 A046474 A056146 this_sequence A089678 A072712 A046476

Adjacent sequences: A115832 A115833 A115834 this_sequence A115836 A115837 A115838

nonn

Zak Seidov (zakseidov(AT)yahoo.com), Feb 01 2006

a(20) from Robert G. Wilson v (rgwv(at)rgwv.com), Feb 03 2006