A259495 - cp's OEIS frontend

A259495 Numbers k such that sigma(k) + phi(k) + d(k) = sigma(k+1) + phi(k+1) + d(k+1), where sigma(k) is the sum of the divisors of k, phi(k) the Euler totient function of k and d(k) the number of divisors of k.

n	a(n)
1	4
2	285
3	902
4	2013
5	8493
6	37406
7	61918
8	90094
9	120001
10	184484
11	250550
12	303853
13	352941
14	360446
15	375565
16	501693
17	724934
18	889285
19	940093
20	995630
21	1079662
22	1473565
23	1488957
24	1517206
25	1573045
26	1581806
27	1692302
28	1864285
29	2048973
30	2693517
31	3393934
32	3509997
33	4083526
34	4194406

[4, 285, 902, 2013, 8493, 37406, 61918, 90094, 120001, 184484, 250550, 303853, 352941, 360446, 375565, 501693, 724934, 889285, 940093, 995630, 1079662, 1473565, 1488957, 1517206, 1573045, 1581806, 1692302, 1864285, 2048973, 2693517, 3393934, 3509997, 4083526, 4194406]

cp's OEIS Frontend

A259495 Numbers k such that sigma(k) + phi(k) + d(k) = sigma(k+1) + phi(k+1) + d(k+1), where sigma(k) is the sum of the divisors of k, phi(k) the Euler totient function of k and d(k) the number of divisors of k.

Table of values

List of values