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Row sums in A083175.
4

%I #3 Dec 05 2013 19:56:14

%S 2,12,30,84,165,312,476,760,1035,1740,2046,3108,3731,4816,5640,7632,

%T 9027,10980,12730,15620,16863,20856,22908,27768,31525,36764,38934,

%U 44940,47415,54240,62992,71264,76857,85068,93870,103284,110371,123880,130260

%N Row sums in A083175.

%C If p is a prime then a(p) = prime(p)*T(p), where T(p) = the p-th triangular number.

%o (PARI) for(i=1,120,p=prime(i);s=p*((i-1)*(i))/2;t=sum(k=1,i-1,p*k);k=i;while(denominator((s+k*p)/i)>1,k++);t+=k*p;print1(t,",")) (Herrgesell)

%Y Cf. A083173, A083174, A083176.

%K nonn

%O 1,1

%A _Amarnath Murthy_, Apr 26 2003

%E More terms from Lambert Herrgesell (zero815(AT)googlemail.com), Dec 30 2005