A281023 Partial sums of A067392.

0, 2, 5, 11, 16, 31, 38, 58, 76, 111, 122, 176, 189, 252, 312, 384, 401, 518, 537, 667, 772, 915, 938, 1142, 1217, 1412, 1547, 1785, 1814, 2159, 2190, 2462, 2693, 3016, 3226, 3676, 3713, 4112, 4424, 4924, 4965, 5616, 5659, 6209, 6704, 7279, 7326, 8118, 8314

Offset

1,2

Links

Table of n, a(n) for n=1..49.

Formula

a(n) = Sum_{i=1..n} A067392(i).

Prog

(Magma) [0] cat [&+[&+[h: h in [2..k] | GCD(h, k) ne 1]: k in [2..n]]: n in [2..100]]

Crossrefs

Cf. A067392(n) = sum of cototatives of n.

Cf. A281024.

Sequence in context: A287558 A024917 A081402 * A359399 A118660 A009770

Adjacent sequences: A281020 A281021 A281022 * A281024 A281025 A281026

Keyword

nonn

Author

Jaroslav Krizek, Jan 14 2017

Status

approved