31361

Appears in sequences

• Strong pseudoprimes to base 45.at n=10A020271
• Smallest number m such that m^2+1 is divisible by A002144(n)^2 (= squares of primes congruent to 1 mod 4).at n=26A059321
• Indices of primes in sequence defined by A(0) = 43, A(n) = 10*A(n-1) + 33 for n > 0.at n=29A101730
• Matrix logarithm of triangle A104980.at n=59A104986
• Number of base 27 circular n-digit numbers with adjacent digits differing by 6 or less.at n=4A125415
• a(n) = 40*n^2 + 1.at n=28A158602
• Central coefficient in (1 + x + 2^n*x^2)^n.at n=5A188140
• Least positive integer k with prime(k)^2-2 and prime(prime(k))^2-2 both prime such that prime(k*n)^2-2 and prime(prime(k*n))^2-2 are all prime.at n=39A261281
• a(n) = 1 + Sum_{k=0..floor((n-1)/2)} a(k) * a(n-2*k-1).at n=16A351972