A135025 - cp's OEIS frontend

A135025 Let b(1) = 2; and for n>= 2, if b(n-1) < prime(n) then b(n) = b(n-1) + prime(n) otherwise b(n) = b(n-1) - prime(n). The sequence gives the indices n where b(n-1) < b(n) < b(n+1).

n	a(n)
1	4
2	9
3	22
4	57
5	146
6	367
7	946
8	2507
9	6634
10	17777
11	48522
12	133107
13	369020
14	1028405
15	2880288
16	8100949
17	22877146
18	64823569
19	184274932
20	525282741
21	1501215194
22	4299836187
23	12340952050
24	35486796313
25	102220582466
26	294917666855
27	852123981582
28	2465458792769

[4, 9, 22, 57, 146, 367, 946, 2507, 6634, 17777, 48522, 133107, 369020, 1028405, 2880288, 8100949, 22877146, 64823569, 184274932, 525282741, 1501215194, 4299836187, 12340952050, 35486796313, 102220582466, 294917666855, 852123981582, 2465458792769]

cp's OEIS Frontend

A135025 Let b(1) = 2; and for n>= 2, if b(n-1) < prime(n) then b(n) = b(n-1) + prime(n) otherwise b(n) = b(n-1) - prime(n). The sequence gives the indices n where b(n-1) < b(n) < b(n+1).

Table of values

List of values