23545

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has period 53.at n=36A020392
• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 14.at n=12A031602
• Downward vertical of triangular spiral in A051682.at n=36A081272
• Sum of terms in n-th row of A081491.at n=16A081492
• Totally multiplicative sequence with a(p) = a(p-1) + 8 for prime p.at n=38A166705
• Number of (n+1)X(1+1) 0..2 arrays with the maximum plus the upper median minus the minimum of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one.at n=4A237504
• Number of (n+1) X (5+1) 0..2 arrays with the maximum plus the upper median minus the minimum of every 2 X 2 subblock differing from its horizontal and vertical neighbors by exactly one.at n=0A237508
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with the maximum plus the upper median minus the minimum of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one.at n=10A237511
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with the maximum plus the upper median minus the minimum of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one.at n=14A237511
• G.f.: Sum_{n>=0} x^n / (1-4*x)^(2*n+1) * [Sum_{k=0..n} C(n,k)^2 * 2^k * x^k] * [Sum_{k=0..n} C(n,k)^2 * 4^k * x^k].at n=5A248053
• a(n) = 32*n^2 - 56*n + 25.at n=28A272129
• Numbers of the form p*q*r where p, q, r are distinct primes congruent to 1 mod 4 such that Legendre(p/q) = Legendre(p/r) = Legendre(q/r) = -1.at n=22A323271
• a(n) is the smallest centered square number with binary weight n.at n=10A359316
• Centered square numbers which are sphenic numbers.at n=12A380882