A211678 - cp's OEIS frontend

A211678 Twin primes p, p+2 with unique values of sigma(p) and sigma(p+2); sigma(n) = A000203(n) = sum of divisors of n.

n	a(n)
1	3
2	5
3	7
4	197
5	199
6	281
7	283
8	347
9	349
10	461
11	463
12	641
13	643
14	821
15	823
16	857
17	859
18	1289
19	1291
20	1697
21	1699
22	1721
23	1723
24	1787
25	1789
26	1877
27	1879
28	2081
29	2083
30	2141
31	2143
32	2381
33	2383
34	2549
35	2551
36	2801
37	2803
38	3257
39	3259
40	3539
41	3541
42	3557
43	3559
44	3929
45	3931
46	4019
47	4021

[3, 5, 7, 197, 199, 281, 283, 347, 349, 461, 463, 641, 643, 821, 823, 857, 859, 1289, 1291, 1697, 1699, 1721, 1723, 1787, 1789, 1877, 1879, 2081, 2083, 2141, 2143, 2381, 2383, 2549, 2551, 2801, 2803, 3257, 3259, 3539, 3541, 3557, 3559, 3929, 3931, 4019, 4021]

cp's OEIS Frontend

A211678 Twin primes p, p+2 with unique values of sigma(p) and sigma(p+2); sigma(n) = A000203(n) = sum of divisors of n.

Table of values

List of values