53971

Appears in sequences

• Strong pseudoprimes to base 5.at n=14A020231
• Strong pseudoprimes to base 25.at n=33A020251
• Strong pseudoprimes to base 39.at n=23A020265
• Strong pseudoprimes to base 44.at n=33A020270
• Numbers k such that 63*2^k-1 is prime.at n=39A050557
• Numbers k such that there are 10 digits in k^2 and for each factor f of 10 (1, 2, 5) the sum of digit groupings of size f is a square.at n=21A153748
• The consecutive squares of numbers multiplied by their next consecutive integer.at n=28A193608
• Number of n X 2 arrays of the minimum value of corresponding elements and their horizontal or vertical neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..2 n X 2 array.at n=28A219589
• Euler pseudoprimes to base 5: composite integers such that abs(5^((n - 1)/2)) == 1 mod n.at n=31A262052
• Positive numbers k such that the centered cube number k^3 + (k+1)^3 is equal to the difference of two positive cubes and to A352755(n).at n=16A352756
• Number of graphs (with n vertices) admitting a strictly matched involution.at n=11A363771
• Base-5 Euler-Jacobi pseudoprimes: odd composite k coprime to 5 such that 5^((k-1)/2) == (5/k) (mod n), where (5/k) is the Jacobi symbol (or Kronecker symbol).at n=23A375914
• Composite numbers k == 1, 9 (mod 10) such that 5^((k-1)/2) == 1 (mod k).at n=22A375915
• Number of edges in the directed graph for the Reversed Zeckendorf game with starting number n.at n=60A389617