A347603 - cp's OEIS frontend

A347603 Numbers k such that tau(k) = 2*tau(k-1) and sigma(k) = sigma(k-1), where tau(k) and sigma(k) are respectively the number and sum functions of the divisors of k.

n	a(n)
1	4365
2	74919
3	79827
4	111507
5	347739
6	445875
7	739557
8	2168907
9	4481986
10	7263945
11	7845387
12	9309465
13	10838247
14	12290055
15	12673095
16	18151479
17	22083215
18	25645707
19	39175955
20	62634519
21	69076995
22	72794967
23	80889207
24	81166839
25	87215967
26	94682133
27	107522943
28	110768835
29	119192283

[4365, 74919, 79827, 111507, 347739, 445875, 739557, 2168907, 4481986, 7263945, 7845387, 9309465, 10838247, 12290055, 12673095, 18151479, 22083215, 25645707, 39175955, 62634519, 69076995, 72794967, 80889207, 81166839, 87215967, 94682133, 107522943, 110768835, 119192283]

cp's OEIS Frontend

A347603 Numbers k such that tau(k) = 2*tau(k-1) and sigma(k) = sigma(k-1), where tau(k) and sigma(k) are respectively the number and sum functions of the divisors of k.

Table of values

List of values