491531

Properties

Appears in sequences

• Primes p such that p^2 divides 7^(p-1) - 1.at n=1A123693
• 2nd Wieferich prime base prime(n).at n=3A178871
• Numbers n such that 7^A000010(n) == 1 (mod n^2).at n=6A242960
• Primes p for which exactly seven bases b with 1 < b < p exist such that p is a base-b Wieferich prime.at n=1A255210
• Smallest base-b Wieferich prime larger than b, where b = prime(n).at n=3A255838
• Second base-n Wieferich prime, i.e., second smallest prime p such that n^(p-1) == 1 (mod p^2).at n=5A268352
• Square array read by antidiagonals downwards: A(n, 1) = second Wieferich prime to base n and A(n, k) = second Wieferich prime to base A(n, k-1) for k > 1.at n=6A281002
• Prime numbersat n=40885