A318737 - cp's OEIS frontend

A318737 Numbers n=2k-1 where Sum_{j=1..k} (-1)^(j+1) d(2*j-1) achieves a new record, with d(n) = number of divisors of n (A000005).

n	a(n)
1	1
2	9
3	25
4	49
5	85
6	133
7	169
8	225
9	445
10	845
11	973
12	1125
13	2205
14	2209
15	2469
16	2829
17	7929
18	9429
19	9945
20	23569
21	24073
22	24645
23	26145
24	40425
25	68153
26	71289
27	72413
28	89517
29	112233
30	112245
31	128973
32	162405
33	162409
34	162429
35	297073
36	477489
37	477493
38	502713
39	561253

[1, 9, 25, 49, 85, 133, 169, 225, 445, 845, 973, 1125, 2205, 2209, 2469, 2829, 7929, 9429, 9945, 23569, 24073, 24645, 26145, 40425, 68153, 71289, 72413, 89517, 112233, 112245, 128973, 162405, 162409, 162429, 297073, 477489, 477493, 502713, 561253]

cp's OEIS Frontend

A318737 Numbers n=2k-1 where Sum_{j=1..k} (-1)^(j+1) d(2*j-1) achieves a new record, with d(n) = number of divisors of n (A000005).

Table of values

List of values

cp's OEIS Frontend

A318737 Numbers n=2*k-1 where Sum_{j=1..k} (-1)^(j+1) * d(2*j-1) achieves a new record, with d(n) = number of divisors of n (A000005).

Table of values

List of values

A318737 Numbers n=2k-1 where Sum_{j=1..k} (-1)^(j+1) d(2*j-1) achieves a new record, with d(n) = number of divisors of n (A000005).