|
|
A348391
|
|
Row sums of irregular triangle A348390.
|
|
2
|
|
|
3, 7, 18, 24, 48, 56, 87, 109, 147, 159, 235, 249, 301, 355, 434, 452, 563, 583, 705, 779, 859, 883, 1087, 1143, 1237, 1331, 1499, 1529, 1781, 1813, 2004, 2118, 2240, 2358, 2701, 2739, 2875, 3009, 3339, 3381, 3729, 3773
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
2,1
|
|
LINKS
|
|
|
FORMULA
|
|
|
EXAMPLE
|
a(5) = 2 + 3 + 4 + 5 + 1 + 4 + 1 + 1 + 2 + 1 = (1 + 1 + 1 + 2 + 1) + (2 + 3 + 4 + 5 + 4) = 6 + 18 = 24.
|
|
MATHEMATICA
|
nterms=50; Table[Total[Flatten[Table[Join[Most[Divisors[k]], Range[2k, n, k]], {k, n}]]], {n, 2, nterms+1}] (* Paolo Xausa, Nov 23 2021 *)
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,easy
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|