A340015 - cp's OEIS frontend

A340015 a(n) is the least even number not used earlier and equal to the sum of the odd digits of the terms up to and including a(n), if such a number exists; otherwise, a(n) is the least odd number not occurring earlier.

n	a(n)
0	0
1	1
2	3
3	4
4	5
5	10
6	7
7	18
8	9
9	30
10	11
11	13
12	15
13	42
14	17
15	19
16	60
17	21
18	23
19	64
20	25
21	76
22	27
23	92
24	29
25	102
26	31
27	33
28	114
29	116
30	118
31	35
32	130
33	134
34	138
35	37
36	154
37	39
38	174
39	41
40	43
41	45
42	184
43	194
44	47
45	49
46	51
47	53
48	224
49	55
50	57
51	246
52	59
53	260
54	61
55	63
56	264
57	65
58	276
59	67
60	292
61	69
62	304
63	71
64	316
65	73
66	332
67	338
68	75
69	358
70	77
71	79
72	81
73	83
74	85
75	87
76	404
77	89
78	414
79	91

[0, 1, 3, 4, 5, 10, 7, 18, 9, 30, 11, 13, 15, 42, 17, 19, 60, 21, 23, 64, 25, 76, 27, 92, 29, 102, 31, 33, 114, 116, 118, 35, 130, 134, 138, 37, 154, 39, 174, 41, 43, 45, 184, 194, 47, 49, 51, 53, 224, 55, 57, 246, 59, 260, 61, 63, 264, 65, 276, 67, 292, 69, 304, 71, 316, 73, 332, 338, 75, 358, 77, 79, 81, 83, 85, 87, 404, 89, 414, 91]

cp's OEIS Frontend

A340015 a(n) is the least even number not used earlier and equal to the sum of the odd digits of the terms up to and including a(n), if such a number exists; otherwise, a(n) is the least odd number not occurring earlier.

Table of values

List of values

n	a(n)
0	0
1	1
2	3
3	4
4	5
5	10
6	7
7	18
8	9
9	30
10	11
11	13
12	15
13	42
14	17
15	19
16	60
17	21
18	23
19	64
20	25
21	76
22	27
23	92
24	29
25	102
26	31
27	33
28	114
29	116
30	118
31	35
32	130
33	134
34	138
35	37
36	154
37	39
38	174
39	41
40	43
41	45
42	184
43	194
44	47
45	49
46	51
47	53
48	224
49	55
50	57
51	246
52	59
53	260
54	61
55	63
56	264
57	65
58	276
59	67
60	292
61	69
62	304
63	71
64	316
65	73
66	332
67	338
68	75
69	358
70	77
71	79
72	81
73	83
74	85
75	87
76	404
77	89
78	414
79	91

n	a(n)
0	0
1	1
2	3
3	4
4	5
5	10
6	7
7	18
8	9
9	30
10	11
11	13
12	15
13	42
14	17
15	19
16	60
17	21
18	23
19	64
20	25
21	76
22	27
23	92
24	29
25	102
26	31
27	33
28	114
29	116
30	118
31	35
32	130
33	134
34	138
35	37
36	154
37	39
38	174
39	41
40	43
41	45
42	184
43	194
44	47
45	49
46	51
47	53
48	224
49	55
50	57
51	246
52	59
53	260
54	61
55	63
56	264
57	65
58	276
59	67
60	292
61	69
62	304
63	71
64	316
65	73
66	332
67	338
68	75
69	358
70	77
71	79
72	81
73	83
74	85
75	87
76	404
77	89
78	414
79	91

n	a(n)
0	0
1	1
2	3
3	4
4	5
5	10
6	7
7	18
8	9
9	30
10	11
11	13
12	15
13	42
14	17
15	19
16	60
17	21
18	23
19	64
20	25
21	76
22	27
23	92
24	29
25	102
26	31
27	33
28	114
29	116
30	118
31	35
32	130
33	134
34	138
35	37
36	154
37	39
38	174
39	41
40	43
41	45
42	184
43	194
44	47
45	49
46	51
47	53
48	224
49	55
50	57
51	246
52	59
53	260
54	61
55	63
56	264
57	65
58	276
59	67
60	292
61	69
62	304
63	71
64	316
65	73
66	332
67	338
68	75
69	358
70	77
71	79
72	81
73	83
74	85
75	87
76	404
77	89
78	414
79	91