A083719 - OEIS

%I #9 Jun 12 2021 06:37:37

%S 0,1,6,18,44,90,174,294,472,702,1010,1430,1932,2574,3346,4230,5264,

%T 6494,7938,9538,11380,13440,15686,18216,21000,24100,27586,31374,35420,

%U 39788,44430,49414,55072,61116,67626,74480,81972,89836,98230,107172,116600,126608

%N a(n) = n * [1 + sum(k=1 to n-1) prime(k)].

%H Harvey P. Dale, <a href="/A083719/b083719.txt">Table of n, a(n) for n = 0..1000</a>

%t With[{nn=40},Join[{0,1},Times@@@Thread[{Range[2,nn+1], Accumulate[ Prime[ Range[ nn]]]+ 1}]]] (* _Harvey P. Dale_, Mar 03 2016 *)

%K nonn

%O 0,3

%A _N. J. A. Sloane_, Jun 16 2003