22530

Appears in sequences

• Coordination sequence for A_9 lattice.at n=3A008393
• a(0) = 1, a(n) = 22*n^2 + 2 for n>0.at n=32A010012
• Least term in period of continued fraction for sqrt(n) is 10.at n=32A031434
• Square array T(n,k) (n >= 1, k >= 0) read by antidiagonals: coordination sequence for root lattice A_n.at n=69A103881
• Numbers k such that 2k+1, 4k+1, 6k+1 and 8k+1 are primes.at n=16A124409
• Number of integer sequences of length n+1 with sum zero and sum of absolute values 6.at n=8A157052
• a(n) = 100*n^2 + 2*n.at n=14A158127
• a(n) = 900*n^2 + 30.at n=5A158672
• a(n) = 25*n^2 + n.at n=29A173089
• Number of nX2 0..4 arrays with every row and column nondecreasing rightwards and downwards, and the number of instances of each value within one of each other.at n=25A200984
• The point at which the powers of n merge on an 8-digit calculator.at n=39A216069
• Smallest k such that k*2*p(n)^2+1=q is prime, k*2*q^2+1=r, k*2*r^2+1=s, k*2*r^2+1=t, r, s, and t are also prime.at n=32A224496
• a(n) = Sum_{d|n} d^(n/d-1) * (n/d)^(d-1).at n=21A359004
• Array read by antidiagonals upwards: A(n, k) = if(n mod 2 = 0, floor((n+2^k-2) / 2^k), n * (k*2^k+1) + 1).at n=65A391114