A243200 - OEIS

%I #11 Jun 11 2014 21:32:56

%S 0,1,1,3,1,1,1,3,4,4,3,2,2,6,6,5,1,1,5,2,2,2,10,5,5,3,3,3,2,2,2,1,1,1,

%T 3,2,2,5,1,1,3,3,3,3,6,7,4,1,1,1,1,1,4,4,1,1,1,1,3,3,3,1,1,1,2,2,2,2,

%U 2,2,8,6,6,6,1,1,1,1,1,1,7,1,1,1,4,2,2

%N Let A242720(n)-3 = prime(l)*prime(m), l<=m; a(n)=m-l.

%C Since for a prime p>3, p^2 == 1 (mod 3), then for n>2, A242720(n) is not equal to p^2 + 3 (otherwise, lpf(A242720(n) - 1) = 3). So, the sequence has only zero term a(2).

%Y Cf. A242720, A242719, A243154, A243158.

%K nonn

%O 2,4

%A _Vladimir Shevelev_, Jun 01 2014

%E More terms from _Peter J. C. Moses_, Jun 01 2014