A256236 - cp's OEIS frontend

A256236 Smallest b > 1 such that the first n primes p (i.e., A000040(1)-A000040(n)) all satisfy b^(p-1) == 1 (mod p^2), i.e., smallest base b larger than 1 such that any member of the set of first n primes is a base-b Wieferich prime.

n	a(n)
1	5
2	17
3	449
4	557
5	19601
6	132857
7	4486949
8	126664001
9	2363321449
10	5229752849
11	2486195039249
12	16250570614349
13	83322586961893
14	39699586259362801
15	8042447016668335049
16	449320365877347849601
17	4376479338174582826793

[5, 17, 449, 557, 19601, 132857, 4486949, 126664001, 2363321449, 5229752849, 2486195039249, 16250570614349, 83322586961893, 39699586259362801, 8042447016668335049, 449320365877347849601, 4376479338174582826793]

cp's OEIS Frontend

A256236 Smallest b > 1 such that the first n primes p (i.e., A000040(1)-A000040(n)) all satisfy b^(p-1) == 1 (mod p^2), i.e., smallest base b larger than 1 such that any member of the set of first n primes is a base-b Wieferich prime.

Table of values

List of values