1,1

Nathaniel Johnston, Table of n, a(n) for n = 1..10000

Omar E. Pol, Illustration: Divisors and pi(x)

p2:=2:for n from 1 to 78 do p1:=p2:p2:=ithprime(n+1):if(p2-p1<>tau(n))then print(n); fi:od: # Nathaniel Johnston, Apr 15 2011

Cf. A000005, A001223, A068526, A161911, A161912, A162188, A162189.

Sequence in context: A071768 A301478 A173297 * A020673 A166498 A266297

Adjacent sequences: A161910 A161911 A161912 * A161914 A161915 A161916

easy,nonn

Omar E. Pol, Jul 04 2009

approved