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URL: https://oeis.org/A391637

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A391637
Partial sums of A094345.
0
0, 1, 4, 8, 14, 23, 34, 48, 66, 85, 106, 130, 156, 185, 218, 254, 294, 339, 386, 436, 490, 547, 608, 674, 744, 819, 900, 982, 1066, 1153, 1242, 1334, 1430, 1529, 1632, 1740, 1850, 1963, 2080, 2200, 2324, 2453, 2586, 2724, 2868, 3015, 3166, 3322, 3482, 3647, 3818, 3994
OFFSET
0,3
FORMULA
a(n) = a(n-1) + Sum_{i=1..n} A053735(i), with a(0) = 0.
a(n) = a(n-1) + A094345(n), with a(0) = 0.
MATHEMATICA
a[n_]:=Sum[Sum[Total[IntegerDigits[i, 3]], {i, j}], {j, n}]; Array[a, 55, 0] (* Stefano Spezia, Jan 17 2026 *)
CROSSREFS
Sequence in context: A049628 A063757 A193711 * A079328 A073612 A227621
KEYWORD
nonn,base
AUTHOR
George Lamont, Jan 16 2026
STATUS
approved