40487

Properties

Appears in sequences

• Primes p from A031924 such that A052180(primepi(p)) = 19.at n=29A052235
• "Non-generous primes": primes p whose least positive primitive root is not a primitive root of p^2.at n=1A055578
• Primes p that have at least four primitive roots that are not primitive roots mod p^2.at n=2A060520
• Primes of the form (1+2n+3n^2+4n^3)/2.at n=5A123077
• Primes p such that p^2 divides 5^(p-1) - 1.at n=2A123692
• Numbers k such that 5^k mod k = 5^k mod k^2.at n=42A125775
• Smallest prime p such that there exist exactly n integers b such that 1 < b < p and b^(p-1) == 1 (mod p^2) or, equivalently, Fermat quotient q_p(b) == 0 (mod p).at n=8A175932
• Numbers n such that 5^A000010(n) == 1 (mod n^2).at n=2A242959
• Main diagonal of Ludic array A255127 (and A255129): a(n) = A255127(n,n).at n=31A255410
• n-th Wieferich prime to base prime(n), i.e., primes p such that p is the n-th solution of the congruence (prime(n))^(p-1) == 1 (mod p^2).at n=2A259909
• The first prime of 8 consecutive primes a, b, c, d, e, f, g, h such that a + g = c + e and b + h = d + f.at n=33A292618
• Odd numbers k such that the ring of integers of Q(5^(1/k)) is not Z[5^(1/k)].at n=1A342391
• Primes q such that 15*q-4, 15*q-2, 15*q+2 and 15*q+4 are all primes.at n=18A342717
• Primes having only {0, 4, 7, 8} as digits.at n=20A386074
• Prime numbersat n=4244