A374463 - cp's OEIS frontend

A374463 Numbers k such that the odd parts of sigma(k) and A064989(k) are equal, where A064989 shifts the prime factorization one step towards lower primes, and sigma is the sum of divisors function.

n	a(n)
1	1
2	3
3	5
4	15
5	189
6	945
7	2125
8	6375
9	9261
10	42550
11	46305
12	127650
13	401625
14	936100
15	1191400
16	2808300
17	3574200
18	8041950
19	19679625
20	22469750
21	58378600
22	58506250
23	67409250
24	175135800
25	175518750
26	176922900
27	394055550
28	494334500

[1, 3, 5, 15, 189, 945, 2125, 6375, 9261, 42550, 46305, 127650, 401625, 936100, 1191400, 2808300, 3574200, 8041950, 19679625, 22469750, 58378600, 58506250, 67409250, 175135800, 175518750, 176922900, 394055550, 494334500]

cp's OEIS Frontend

A374463 Numbers k such that the odd parts of sigma(k) and A064989(k) are equal, 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