A113604 - cp's OEIS frontend

A113604 Define f(k) = k + sum of digits of n. a(n) is the first prime that results by applying f zero or more times to n, or 0 if no such prime exists.

n	a(n)
1	2
2	2
3	3
4	23
5	5
6	0
7	7
8	23
9	0
10	11
11	11
12	0
13	13
14	19
15	0
16	23
17	17
18	0
19	19
20	41
21	0
22	41
23	23
24	0
25	37
26	41
27	0
28	101
29	29
30	0
31	31
32	37
33	0
34	41
35	43
36	0
37	37
38	101
39	0
40	59
41	41
42	0
43	43
44	59
45	0
46	67
47	47
48	0
49	101
50	89
51	0
52	59
53	53
54	0
55	89
56	67
57	0
58	71
59	59
60	0
61	61
62	101
63	0
64	127
65	89
66	0
67	67
68	103
69	0
70	101
71	71
72	0
73	73
74	127
75	0
76	89

[2, 2, 3, 23, 5, 0, 7, 23, 0, 11, 11, 0, 13, 19, 0, 23, 17, 0, 19, 41, 0, 41, 23, 0, 37, 41, 0, 101, 29, 0, 31, 37, 0, 41, 43, 0, 37, 101, 0, 59, 41, 0, 43, 59, 0, 67, 47, 0, 101, 89, 0, 59, 53, 0, 89, 67, 0, 71, 59, 0, 61, 101, 0, 127, 89, 0, 67, 103, 0, 101, 71, 0, 73, 127, 0, 89]

cp's OEIS Frontend

A113604 Define f(k) = k + sum of digits of n. a(n) is the first prime that results by applying f zero or more times to n, or 0 if no such prime exists.

Table of values

List of values

n	a(n)
1	2
2	2
3	3
4	23
5	5
6	0
7	7
8	23
9	0
10	11
11	11
12	0
13	13
14	19
15	0
16	23
17	17
18	0
19	19
20	41
21	0
22	41
23	23
24	0
25	37
26	41
27	0
28	101
29	29
30	0
31	31
32	37
33	0
34	41
35	43
36	0
37	37
38	101
39	0
40	59
41	41
42	0
43	43
44	59
45	0
46	67
47	47
48	0
49	101
50	89
51	0
52	59
53	53
54	0
55	89
56	67
57	0
58	71
59	59
60	0
61	61
62	101
63	0
64	127
65	89
66	0
67	67
68	103
69	0
70	101
71	71
72	0
73	73
74	127
75	0
76	89

n	a(n)
1	2
2	2
3	3
4	23
5	5
6	0
7	7
8	23
9	0
10	11
11	11
12	0
13	13
14	19
15	0
16	23
17	17
18	0
19	19
20	41
21	0
22	41
23	23
24	0
25	37
26	41
27	0
28	101
29	29
30	0
31	31
32	37
33	0
34	41
35	43
36	0
37	37
38	101
39	0
40	59
41	41
42	0
43	43
44	59
45	0
46	67
47	47
48	0
49	101
50	89
51	0
52	59
53	53
54	0
55	89
56	67
57	0
58	71
59	59
60	0
61	61
62	101
63	0
64	127
65	89
66	0
67	67
68	103
69	0
70	101
71	71
72	0
73	73
74	127
75	0
76	89

n	a(n)
1	2
2	2
3	3
4	23
5	5
6	0
7	7
8	23
9	0
10	11
11	11
12	0
13	13
14	19
15	0
16	23
17	17
18	0
19	19
20	41
21	0
22	41
23	23
24	0
25	37
26	41
27	0
28	101
29	29
30	0
31	31
32	37
33	0
34	41
35	43
36	0
37	37
38	101
39	0
40	59
41	41
42	0
43	43
44	59
45	0
46	67
47	47
48	0
49	101
50	89
51	0
52	59
53	53
54	0
55	89
56	67
57	0
58	71
59	59
60	0
61	61
62	101
63	0
64	127
65	89
66	0
67	67
68	103
69	0
70	101
71	71
72	0
73	73
74	127
75	0
76	89