A211767 - cp's OEIS frontend

A211767 Lesser of 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	197
4	281
5	347
6	461
7	641
8	821
9	857
10	1289
11	1697
12	1721
13	1787
14	1877
15	2081
16	2141
17	2381
18	2549
19	2801
20	3257
21	3539
22	3557
23	3929
24	4019
25	4241
26	4637
27	4721
28	5441
29	5477
30	5501
31	5657
32	6449
33	6689
34	6701
35	6761
36	6827
37	6947
38	7457
39	7589
40	7877
41	8009
42	8387
43	8537
44	8597
45	8627

[3, 5, 197, 281, 347, 461, 641, 821, 857, 1289, 1697, 1721, 1787, 1877, 2081, 2141, 2381, 2549, 2801, 3257, 3539, 3557, 3929, 4019, 4241, 4637, 4721, 5441, 5477, 5501, 5657, 6449, 6689, 6701, 6761, 6827, 6947, 7457, 7589, 7877, 8009, 8387, 8537, 8597, 8627]

cp's OEIS Frontend

A211767 Lesser of 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