A261198 - cp's OEIS frontend

A261198 Start with n and repeat the map x -> x+sumdigits(x) until reaching a prime, which is a(n), or 0 if no prime is reached.

n	a(n)
1	2
2	23
3	0
4	23
5	11
6	0
7	19
8	23
9	0
10	11
11	13
12	0
13	17
14	19
15	0
16	23
17	37
18	0
19	29
20	41
21	0
22	41
23	101
24	0
25	37
26	41
27	0
28	101
29	59
30	0
31	43
32	37
33	0
34	41
35	43
36	0
37	47
38	101
39	0
40	59
41	67
42	0
43	89
44	59
45	0
46	67
47	71
48	0
49	101
50	89
51	0
52	59
53	61
54	0
55	89
56	67
57	0
58	71
59	73
60	0
61	103
62	101
63	0
64	127
65	89
66	0
67	109
68	103
69	0
70	101
71	79
72	0
73	83
74	127
75	0
76	89
77	101
78	0
79	109
80	109
81	0
82	103
83	107
84	0
85	127
86	101
87	0
88	109
89	113
90	0
91	101
92	103
93	0
94	107
95	109
96	0
97	113
98	127
99	0
100	101

[2, 23, 0, 23, 11, 0, 19, 23, 0, 11, 13, 0, 17, 19, 0, 23, 37, 0, 29, 41, 0, 41, 101, 0, 37, 41, 0, 101, 59, 0, 43, 37, 0, 41, 43, 0, 47, 101, 0, 59, 67, 0, 89, 59, 0, 67, 71, 0, 101, 89, 0, 59, 61, 0, 89, 67, 0, 71, 73, 0, 103, 101, 0, 127, 89, 0, 109, 103, 0, 101, 79, 0, 83, 127, 0, 89, 101, 0, 109, 109, 0, 103, 107, 0, 127, 101, 0, 109, 113, 0, 101, 103, 0, 107, 109, 0, 113, 127, 0, 101]

cp's OEIS Frontend

A261198 Start with n and repeat the map x -> x+sumdigits(x) until reaching a prime, which is a(n), or 0 if no prime is reached.

Table of values

List of values

n	a(n)
1	2
2	23
3	0
4	23
5	11
6	0
7	19
8	23
9	0
10	11
11	13
12	0
13	17
14	19
15	0
16	23
17	37
18	0
19	29
20	41
21	0
22	41
23	101
24	0
25	37
26	41
27	0
28	101
29	59
30	0
31	43
32	37
33	0
34	41
35	43
36	0
37	47
38	101
39	0
40	59
41	67
42	0
43	89
44	59
45	0
46	67
47	71
48	0
49	101
50	89
51	0
52	59
53	61
54	0
55	89
56	67
57	0
58	71
59	73
60	0
61	103
62	101
63	0
64	127
65	89
66	0
67	109
68	103
69	0
70	101
71	79
72	0
73	83
74	127
75	0
76	89
77	101
78	0
79	109
80	109
81	0
82	103
83	107
84	0
85	127
86	101
87	0
88	109
89	113
90	0
91	101
92	103
93	0
94	107
95	109
96	0
97	113
98	127
99	0
100	101

n	a(n)
1	2
2	23
3	0
4	23
5	11
6	0
7	19
8	23
9	0
10	11
11	13
12	0
13	17
14	19
15	0
16	23
17	37
18	0
19	29
20	41
21	0
22	41
23	101
24	0
25	37
26	41
27	0
28	101
29	59
30	0
31	43
32	37
33	0
34	41
35	43
36	0
37	47
38	101
39	0
40	59
41	67
42	0
43	89
44	59
45	0
46	67
47	71
48	0
49	101
50	89
51	0
52	59
53	61
54	0
55	89
56	67
57	0
58	71
59	73
60	0
61	103
62	101
63	0
64	127
65	89
66	0
67	109
68	103
69	0
70	101
71	79
72	0
73	83
74	127
75	0
76	89
77	101
78	0
79	109
80	109
81	0
82	103
83	107
84	0
85	127
86	101
87	0
88	109
89	113
90	0
91	101
92	103
93	0
94	107
95	109
96	0
97	113
98	127
99	0
100	101

n	a(n)
1	2
2	23
3	0
4	23
5	11
6	0
7	19
8	23
9	0
10	11
11	13
12	0
13	17
14	19
15	0
16	23
17	37
18	0
19	29
20	41
21	0
22	41
23	101
24	0
25	37
26	41
27	0
28	101
29	59
30	0
31	43
32	37
33	0
34	41
35	43
36	0
37	47
38	101
39	0
40	59
41	67
42	0
43	89
44	59
45	0
46	67
47	71
48	0
49	101
50	89
51	0
52	59
53	61
54	0
55	89
56	67
57	0
58	71
59	73
60	0
61	103
62	101
63	0
64	127
65	89
66	0
67	109
68	103
69	0
70	101
71	79
72	0
73	83
74	127
75	0
76	89
77	101
78	0
79	109
80	109
81	0
82	103
83	107
84	0
85	127
86	101
87	0
88	109
89	113
90	0
91	101
92	103
93	0
94	107
95	109
96	0
97	113
98	127
99	0
100	101