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A134128 a(n) = A007504(A134126(n)). 5

%I #9 May 11 2023 09:34:39

%S 2,5,17,58,129,5117,43201,329401,1459228,111461983,269553485,

%T 316504138,734845192,6185946407,10731178047,22691403557,148086969623,

%U 474635764987,6777574922490,30458710811303

%N a(n) = A007504(A134126(n)).

%C This is the prime partial sum just before the prime is added to achieve an integer mean as defined in A134125.

%e The sequence begins with a(1)=2 (to which 3 is added which leads to a sum 5 associated with A134125(1)).

%e a(4) = 58 (to which the prime 19 is added, a sum of 77, associated with A134125(4)).

%o (UBASIC) 10 'primes using counters 20 N=3:C=1:R=5:print 2;3,5 30 A=3:S=sqrt(N) 40 B=N\A 50 if B*A=N then N=N+2:goto 30 60 A=A+2:O=A 70 if A<=sqrt(N) then 40 80 C=C+1 90 R=R+N:T=R/C:U=R-N 100 if T=int(T) then print C;U;N;R;T:stop 110 N=N+2:goto 30

%Y Cf. A134125, A134126, A134127, A134129.

%K less,nonn

%O 1,1

%A _Enoch Haga_, Oct 09 2007

%E Edited by _R. J. Mathar_, Apr 17 2009

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Last modified April 24 20:08 EDT 2024. Contains 371963 sequences. (Running on oeis4.)