A078425 - cp's OEIS frontend

A078425 Primes in "Ulam's Prime sequence". A prime is in the sequence iff p+1 can be expressed in exactly 1 way as the sum of 2 previous distinct primes.

n	a(n)
1	3
2	5
3	7
4	11
5	13
6	19
7	29
8	41
9	43
10	59
11	83
12	89
13	107
14	109
15	127
16	139
17	157
18	163
19	173
20	199
21	211
22	223
23	257
24	271
25	277
26	293
27	307
28	331
29	347
30	367
31	397
32	421
33	443
34	457
35	491
36	541
37	557
38	587
39	601
40	631
41	691
42	761
43	769
44	821
45	911
46	941
47	971
48	991
49	1009
50	1033
51	1103
52	1129
53	1153
54	1201

[3, 5, 7, 11, 13, 19, 29, 41, 43, 59, 83, 89, 107, 109, 127, 139, 157, 163, 173, 199, 211, 223, 257, 271, 277, 293, 307, 331, 347, 367, 397, 421, 443, 457, 491, 541, 557, 587, 601, 631, 691, 761, 769, 821, 911, 941, 971, 991, 1009, 1033, 1103, 1129, 1153, 1201]

cp's OEIS Frontend

A078425 Primes in "Ulam's Prime sequence". A prime is in the sequence iff p+1 can be expressed in exactly 1 way as the sum of 2 previous distinct primes.

Table of values

List of values