A131425 - OEIS

%I #7 Nov 28 2024 15:35:39

%S 1,5,16,33,68,101,156,205,280,389,468,605,732,841,988,1181,1392,1545,

%T 1784,1999,2182,2463,2714,3027,3410,3709,3964,4283,4554,4893,5564,

%U 5947,6410,6751,7386,7755,8282,8827,9310,9887,10482,10923,11722,12191,12758,13243

%N Row sums of triangle A131424.

%H Andrew Howroyd, <a href="/A131425/b131425.txt">Table of n, a(n) for n = 1..1000</a>

%F a(n) = n*(prime(n) - 3) + Sum_{k=1..n} prime(k). - _Andrew Howroyd_, Aug 28 2018

%e a(4) = 33 = sum of row 4 terms of triangle A131424: (6 + 7 + 9 + 11).

%t Table[n (Prime[n]-3)+Sum[Prime[k],{k,n}],{n,50}] (* _Harvey P. Dale_, Nov 28 2024 *)

%o (PARI) a(n)={n*(prime(n) - 3) + sum(k=1, n, prime(k))} \\ _Andrew Howroyd_, Aug 28 2018

%Y Cf. A131424, A131426, A127640, A000040.

%K nonn

%O 1,2

%A _Gary W. Adamson_, Jul 10 2007

%E Terms a(10) and beyond from _Andrew Howroyd_, Aug 28 2018