A221991 - cp's OEIS frontend

A221991 a(n) is the number of terms in the expansion of (x-y)(x^2-y^2)(x^3-y^3)(x^5-y^5)...(x^p_i-y^p_i), where p_i is the i-th prime.

n	a(n)
1	2
2	4
3	6
4	8
5	10
6	20
7	22
8	36
9	42
10	66
11	90
12	110
13	142
14	184
15	232
16	284
17	342
18	400
19	458
20	532
21	604
22	678
23	756
24	838
25	928
26	1026
27	1126
28	1230
29	1336
30	1446
31	1558
32	1686
33	1816
34	1954
35	2092
36	2242
37	2392
38	2550
39	2712
40	2880
41	3052
42	3232
43	3412
44	3604
45	3796
46	3994
47	4192
48	4404
49	4626
50	4854
51	5082

[2, 4, 6, 8, 10, 20, 22, 36, 42, 66, 90, 110, 142, 184, 232, 284, 342, 400, 458, 532, 604, 678, 756, 838, 928, 1026, 1126, 1230, 1336, 1446, 1558, 1686, 1816, 1954, 2092, 2242, 2392, 2550, 2712, 2880, 3052, 3232, 3412, 3604, 3796, 3994, 4192, 4404, 4626, 4854, 5082]

cp's OEIS Frontend

A221991 a(n) is the number of terms in the expansion of (x-y)(x^2-y^2)(x^3-y^3)(x^5-y^5)...(x^p_i-y^p_i), where p_i is the i-th prime.

Table of values

List of values

cp's OEIS Frontend

A221991 a(n) is the number of terms in the expansion of (x-y)(x^2-y^2)*(x^3-y^3)*(x^5-y^5)*...*(x^p_i-y^p_i), where p_i is the i-th prime.

Table of values

List of values

A221991 a(n) is the number of terms in the expansion of (x-y)(x^2-y^2)(x^3-y^3)(x^5-y^5)...(x^p_i-y^p_i), where p_i is the i-th prime.