A024850 - cp's OEIS frontend

A024850 Let c(k) denote the k-th composite number and p(k) the k-th prime number; then a(n) = Sum_{i=n(n-1)/2+1 .. n(n+1)/2} c(i) - Sum_{i=1..n} p(i).

n	a(n)
1	2
2	9
3	21
4	46
5	84
6	135
7	206
8	308
9	429
10	583
11	772
12	987
13	1265
14	1552
15	1906
16	2308
17	2767
18	3278
19	3840
20	4478
21	5201
22	5956
23	6783
24	7704
25	8706
26	9777
27	10976
28	12241
29	13591
30	14985
31	16546
32	18230
33	20019
34	21862
35	23824
36	25907
37	28111
38	30474
39	32897
40	35482
41	38208
42	41125
43	44159
44	47239
45	50516
46	53944

[2, 9, 21, 46, 84, 135, 206, 308, 429, 583, 772, 987, 1265, 1552, 1906, 2308, 2767, 3278, 3840, 4478, 5201, 5956, 6783, 7704, 8706, 9777, 10976, 12241, 13591, 14985, 16546, 18230, 20019, 21862, 23824, 25907, 28111, 30474, 32897, 35482, 38208, 41125, 44159, 47239, 50516, 53944]

cp's OEIS Frontend

A024850 Let c(k) denote the k-th composite number and p(k) the k-th prime number; then a(n) = Sum_{i=n(n-1)/2+1 .. n(n+1)/2} c(i) - Sum_{i=1..n} p(i).

Table of values

List of values

cp's OEIS Frontend

A024850 Let c(k) denote the k-th composite number and p(k) the k-th prime number; then a(n) = Sum_{i=n*(n-1)/2+1 .. n*(n+1)/2} c(i) - Sum_{i=1..n} p(i).

Table of values

List of values

A024850 Let c(k) denote the k-th composite number and p(k) the k-th prime number; then a(n) = Sum_{i=n(n-1)/2+1 .. n(n+1)/2} c(i) - Sum_{i=1..n} p(i).