A350072 - cp's OEIS frontend

A350072 a(n) = sigma(n^2) / gcd(sigma(n^2), A003961(n^2)), where A003961 shifts the prime factorization of n one step towards larger primes, and sigma is the sum of divisors function.

n	a(n)
1	1
2	7
3	13
4	31
5	31
6	91
7	57
8	127
9	121
10	31
11	133
12	403
13	183
14	133
15	403
16	511
17	307
18	847
19	381
20	961
21	741
22	931
23	553
24	1651
25	781
26	427
27	1093
28	589
29	871
30	403
31	993
32	2047
33	133
34	2149
35	1767
36	3751
37	1407
38	889
39	2379
40	3937
41	1723
42	1729
43	1893
44	4123
45	3751
46	3871
47	2257
48	6643
49	2801
50	781
51	3991
52	1891
53	2863
54	7651
55	589
56	2413
57	4953
58	6097
59	3541
60	12493

[1, 7, 13, 31, 31, 91, 57, 127, 121, 31, 133, 403, 183, 133, 403, 511, 307, 847, 381, 961, 741, 931, 553, 1651, 781, 427, 1093, 589, 871, 403, 993, 2047, 133, 2149, 1767, 3751, 1407, 889, 2379, 3937, 1723, 1729, 1893, 4123, 3751, 3871, 2257, 6643, 2801, 781, 3991, 1891, 2863, 7651, 589, 2413, 4953, 6097, 3541, 12493]

cp's OEIS Frontend

A350072 a(n) = sigma(n^2) / gcd(sigma(n^2), A003961(n^2)), where A003961 shifts the prime factorization of n one step towards larger primes, and sigma is the sum of divisors function.

Table of values

List of values