A080472 - cp's OEIS frontend

A080472 a(n) = smallest triangular number that is obtained by placing digits anywhere in n; a(n) = n if n is a triangular number.

n	a(n)
1	1
2	21
3	3
4	45
5	15
6	6
7	78
8	28
9	91
10	10
11	171
12	120
13	136
14	1431
15	15
16	136
17	171
18	1081
19	190
20	120
21	21
22	1225
23	231
24	2145
25	253
26	276
27	276
28	28
29	2926
30	300
31	231
32	325
33	3003
34	2346
35	325
36	36
37	378
38	378
39	3916
40	406
41	741
42	4278
43	435
44	4465
45	45
46	406
47	4278
48	1485
49	496
50	1540
51	351
52	528
53	153
54	1540

[1, 21, 3, 45, 15, 6, 78, 28, 91, 10, 171, 120, 136, 1431, 15, 136, 171, 1081, 190, 120, 21, 1225, 231, 2145, 253, 276, 276, 28, 2926, 300, 231, 325, 3003, 2346, 325, 36, 378, 378, 3916, 406, 741, 4278, 435, 4465, 45, 406, 4278, 1485, 496, 1540, 351, 528, 153, 1540]

cp's OEIS Frontend

A080472 a(n) = smallest triangular number that is obtained by placing digits anywhere in n; a(n) = n if n is a triangular number.

Table of values

List of values