A024697 - cp's OEIS frontend

A024697 a(n) = p(1)p(n) + p(2)p(n-1) + ... + p(k)p(n+1-k), where k = [ (n+1)/2 ], p = A000040 = the primes.

n	a(n)
1	4
2	6
3	19
4	29
5	68
6	94
7	177
8	231
9	400
10	484
11	753
12	903
13	1340
14	1552
15	2157
16	2489
17	3352
18	3784
19	5013
20	5515
21	7052
22	7758
23	9773
24	10575
25	13076
26	14076
27	17023
28	18339
29	21876
30	23414
31	27715
32	29437
33	34570
34	36500
35	42335
36	44731
37	51560
38	54198
39	61955
40	65051
41	73700
42	77402
43	87293

[4, 6, 19, 29, 68, 94, 177, 231, 400, 484, 753, 903, 1340, 1552, 2157, 2489, 3352, 3784, 5013, 5515, 7052, 7758, 9773, 10575, 13076, 14076, 17023, 18339, 21876, 23414, 27715, 29437, 34570, 36500, 42335, 44731, 51560, 54198, 61955, 65051, 73700, 77402, 87293]

cp's OEIS Frontend

A024697 a(n) = p(1)p(n) + p(2)p(n-1) + ... + p(k)p(n+1-k), where k = [ (n+1)/2 ], p = A000040 = the primes.

Table of values

List of values