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A161912 a(n) = A040976(n+1) - A006218(n). 7

%I

%S 0,0,0,0,1,1,1,1,1,4,2,6,4,4,4,6,7,7,7,9,5,7,7,11,11,12,10,10,6,8,14,

%T 16,16,14,20,18,15,19,19,21,19,19,21,21,19,15,23,33,27,26,24,26,22,30,

%U 28,30,28,26,28,30,20,28,38,36,31,31,37,41,45,43,39,43,39,43,45,43,43,47,43,49,49,46,52,52,46,46,48,52,48,48,40,48,50,50,54,54,48,58,54,66,63,71,69,73,67,65,71,75,69,69,67,69,63,63,67,73,69,67,69,71,57

%N a(n) = A040976(n+1) - A006218(n).

%p A006128 := proc(n) add(floor(n/k),k=1..n) ; end: A040976 := proc(n) ithprime(n)-2 ; end:

%p A161912 := proc(n) A040976(n+1)-A006128(n) ;end: seq(A161912(n),n=0..120) ; # _R. J. Mathar_, Jul 01 2009

%Y Cf. A000005, A001223, A006218, A040976, A161911.

%K easy,nonn

%O 0,10

%A _Omar E. Pol_, Jun 28 2009

%E Invalid formula deleted and sequence extended by _R. J. Mathar_, Jul 01 2009

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Last modified October 14 09:25 EDT 2019. Contains 327995 sequences. (Running on oeis4.)