20771

Properties

Appears in sequences

• Primes that remain prime through 2 iterations of function f(x) = 8x + 1.at n=35A023260
• Numbers k such that k^2 contains only digits {1,3,4}.at n=6A053890
• Primes p such that x^67 = 2 has no solution mod p.at n=36A059330
• When squared gives number composed just of the digits 1, 2, 3, 4.at n=31A061677
• Primes in which the unit place digit is 1 and the k-th most significant digit is prime (2,3,5,7) if k is prime else is composite (4,6,8,9,0).at n=30A089704
• Smallest odd prime p such that p^2 | n^(p-1) - 1.at n=4A096082
• Smallest prime equal to the sum of n distinct squares.at n=37A100559
• Primes from merging of 5 successive digits in decimal expansion of the Golden Ratio, (1+sqrt(5))/2.at n=21A103809
• Least n-digit prime in base 12 that is a member of twin prime pair and also either a Sophie Germain prime or a safe prime.at n=4A118584
• Primes p such that p^2 divides 5^(p-1) - 1.at n=1A123692
• Numbers k such that 5^k mod k = 5^k mod k^2.at n=34A125775
• Primes congruent to 3 mod 59.at n=40A142730
• Primes congruent to 31 mod 61.at n=39A142829
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 1, 1), (0, 0, 1), (1, 0, -1), (1, 0, 0)}.at n=8A150146
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 1, -1), (1, 0, 0), (1, 1, 0), (1, 1, 1)}.at n=7A151175
• Primes p such that reversal(p) - 13 is a square.at n=24A176371
• 2nd Wieferich prime base prime(n).at n=2A178871
• Number of (w,x,y,z) with all terms in {0,...,n} and 2w-x=max{w,x,y,z}-min{w,x,y,z}.at n=34A212756
• The number of distinct (up to unitary similarity) *-subalgebras of the n X n complex matrices.at n=18A215925
• Smallest prime that can be expressed as the sum of n distinct positive squares with the largest square as small as possible.at n=37A224498