A251964 - cp's OEIS frontend

A251964 For a prime p, denote by s(p,k) the odd part of the digital sum of p^k. Let k_1 be the smallest k such that s(p,k) is divisible by 5. Sequence lists primes p for which s(p,k_1)=5.

n	a(n)
1	2
2	5
3	7
4	11
5	19
6	23
7	37
8	41
9	61
10	71
11	73
12	101
13	109
14	113
15	127
16	131
17	163
18	179
19	181
20	211
21	229
22	241
23	251
24	271
25	307
26	311
27	313
28	383
29	389
30	401
31	421
32	433
33	449
34	479
35	521
36	523
37	541
38	557
39	569
40	571
41	587
42	601
43	613
44	631
45	659
46	677
47	751
48	811
49	827
50	839
51	857
52	929
53	947
54	971
55	977

[2, 5, 7, 11, 19, 23, 37, 41, 61, 71, 73, 101, 109, 113, 127, 131, 163, 179, 181, 211, 229, 241, 251, 271, 307, 311, 313, 383, 389, 401, 421, 433, 449, 479, 521, 523, 541, 557, 569, 571, 587, 601, 613, 631, 659, 677, 751, 811, 827, 839, 857, 929, 947, 971, 977]

cp's OEIS Frontend

A251964 For a prime p, denote by s(p,k) the odd part of the digital sum of p^k. Let k_1 be the smallest k such that s(p,k) is divisible by 5. Sequence lists primes p for which s(p,k_1)=5.

Table of values

List of values

n	a(n)
1	2
2	5
3	7
4	11
5	19
6	23
7	37
8	41
9	61
10	71
11	73
12	101
13	109
14	113
15	127
16	131
17	163
18	179
19	181
20	211
21	229
22	241
23	251
24	271
25	307
26	311
27	313
28	383
29	389
30	401
31	421
32	433
33	449
34	479
35	521
36	523
37	541
38	557
39	569
40	571
41	587
42	601
43	613
44	631
45	659
46	677
47	751
48	811
49	827
50	839
51	857
52	929
53	947
54	971
55	977

n	a(n)
1	2
2	5
3	7
4	11
5	19
6	23
7	37
8	41
9	61
10	71
11	73
12	101
13	109
14	113
15	127
16	131
17	163
18	179
19	181
20	211
21	229
22	241
23	251
24	271
25	307
26	311
27	313
28	383
29	389
30	401
31	421
32	433
33	449
34	479
35	521
36	523
37	541
38	557
39	569
40	571
41	587
42	601
43	613
44	631
45	659
46	677
47	751
48	811
49	827
50	839
51	857
52	929
53	947
54	971
55	977

n	a(n)
1	2
2	5
3	7
4	11
5	19
6	23
7	37
8	41
9	61
10	71
11	73
12	101
13	109
14	113
15	127
16	131
17	163
18	179
19	181
20	211
21	229
22	241
23	251
24	271
25	307
26	311
27	313
28	383
29	389
30	401
31	421
32	433
33	449
34	479
35	521
36	523
37	541
38	557
39	569
40	571
41	587
42	601
43	613
44	631
45	659
46	677
47	751
48	811
49	827
50	839
51	857
52	929
53	947
54	971
55	977