A348754 - cp's OEIS frontend

A348754 Numbers k congruent to 1 or 5 mod 6, for which A064989(A064989(sigma(k))) > A064989(A064989(k)), where A064989 shifts the prime factorization one step towards lower primes, and sigma is the sum of divisors function.

n	a(n)
1	25
2	49
3	121
4	169
5	175
6	275
7	289
8	325
9	625
10	841
11	925
12	1225
13	1445
14	1525
15	1675
16	1681
17	1825
18	2401
19	3025
20	3125
21	3481
22	3757
23	3925
24	4075
25	4225
26	4375
27	4825
28	5041
29	5275
30	5929
31	6125
32	6875
33	6925
34	7075
35	7225
36	7825
37	7921
38	8125
39	8275
40	8281
41	9025
42	9925
43	10201
44	10525
45	10625
46	10693
47	11425
48	11875
49	12005
50	12025
51	13075
52	13225
53	13475

[25, 49, 121, 169, 175, 275, 289, 325, 625, 841, 925, 1225, 1445, 1525, 1675, 1681, 1825, 2401, 3025, 3125, 3481, 3757, 3925, 4075, 4225, 4375, 4825, 5041, 5275, 5929, 6125, 6875, 6925, 7075, 7225, 7825, 7921, 8125, 8275, 8281, 9025, 9925, 10201, 10525, 10625, 10693, 11425, 11875, 12005, 12025, 13075, 13225, 13475]

cp's OEIS Frontend

A348754 Numbers k congruent to 1 or 5 mod 6, for which A064989(A064989(sigma(k))) > A064989(A064989(k)), where A064989 shifts the prime factorization one step towards lower primes, and sigma is the sum of divisors function.

Table of values

List of values