A381183 - cp's OEIS frontend

A381183 a(n) = the smallest positive integer that produces a product that contains the digit 2 when multiplied by 2 at most n times, and where a further multiplication by 2 produces a number that does not contain the digit 2. Set a(n) = -1 if no such number exists.

n	a(n)
0	2
1	1
2	6
3	31
4	128
5	64
6	516
7	331
8	814
9	1607
10	4107
11	10158
12	10258
13	5129
14	10283
15	12819
16	25633
17	28141
18	16163
19	51404
20	80134
21	80864
22	40633
23	80216
24	40108
25	128129
26	250627
27	160626
28	80313
29	125641
30	208141
31	383814
32	391628
33	195814
34	156766
35	196314
36	391563
37	490641
38	806166
39	785313
40	628222
41	314111
42	625322
43	312661
44	1563305
45	2630104
46	1315052
47	657526
48	328763
49	1643815

[2, 1, 6, 31, 128, 64, 516, 331, 814, 1607, 4107, 10158, 10258, 5129, 10283, 12819, 25633, 28141, 16163, 51404, 80134, 80864, 40633, 80216, 40108, 128129, 250627, 160626, 80313, 125641, 208141, 383814, 391628, 195814, 156766, 196314, 391563, 490641, 806166, 785313, 628222, 314111, 625322, 312661, 1563305, 2630104, 1315052, 657526, 328763, 1643815]

cp's OEIS Frontend

A381183 a(n) = the smallest positive integer that produces a product that contains the digit 2 when multiplied by 2 at most n times, and where a further multiplication by 2 produces a number that does not contain the digit 2. Set a(n) = -1 if no such number exists.

Table of values

List of values