A078728 - cp's OEIS frontend

A078728 a(n) is the smallest m such that m < 10^n, 10^n + m is prime and if the natural number k is such that 1 < k < 10 and 3 doesn't divide k10^n + m then k10^n+m is prime.

n	a(n)
1	3
2	57
3	297
4	177
5	237
6	25111
7	231339
8	67419
9	273817
10	345111
11	2001753
12	912277
13	5236153
14	9228627
15	10599391
16	2835261
17	60120003
18	14054037
19	27923629
20	41783347
21	24590943
22	112161513
23	230484021
24	11446969
25	205242589
26	583389307
27	873650007

[3, 57, 297, 177, 237, 25111, 231339, 67419, 273817, 345111, 2001753, 912277, 5236153, 9228627, 10599391, 2835261, 60120003, 14054037, 27923629, 41783347, 24590943, 112161513, 230484021, 11446969, 205242589, 583389307, 873650007]

cp's OEIS Frontend

A078728 a(n) is the smallest m such that m < 10^n, 10^n + m is prime and if the natural number k is such that 1 < k < 10 and 3 doesn't divide k10^n + m then k10^n+m is prime.

Table of values

List of values

cp's OEIS Frontend

A078728 a(n) is the smallest m such that m < 10^n, 10^n + m is prime and if the natural number k is such that 1 < k < 10 and 3 doesn't divide k*10^n + m then k*10^n+m is prime.

Table of values

List of values

A078728 a(n) is the smallest m such that m < 10^n, 10^n + m is prime and if the natural number k is such that 1 < k < 10 and 3 doesn't divide k10^n + m then k10^n+m is prime.