24645

Appears in sequences

• Smallest m such that A065623(m) = n.at n=39A065624
• Composite numbers k such that sigma(k)*(phi(k) + 2) is a square.at n=31A065655
• a(n) = (4*n+3)*(4*n+7).at n=38A085027
• a(n) = K_3(n) = Sum_{k>=0} A090285(3,k)*2^k*binomial(n,k). a(n) = (4*n^3+30*n^2+56*n+15)/3.at n=24A090294
• a(n) = (8*n+3)*(8*n+7).at n=19A146301
• Triangle T(n, k, q) = (q*(n-k) +1)*T(n-1, k-1, q) + (q*k+1)*T(n-1, k, q) + q*A157522(n, k)*T(n-2, k-1, q), with T(n, 0, q) = T(n, n, q) = 1 and q = 1, read by rows.at n=38A157523
• Triangle T(n, k, q) = (q*(n-k) +1)*T(n-1, k-1, q) + (q*k+1)*T(n-1, k, q) + q*A157522(n, k)*T(n-2, k-1, q), with T(n, 0, q) = T(n, n, q) = 1 and q = 1, read by rows.at n=42A157523
• Quintisection A061037(5*n+2).at n=31A165248
• a(n) = prime(n)^2-4.at n=36A166010
• Number of reducible Boolean polynomials of degree n with constant term 1.at n=18A169914
• Number of connected induced (non-null) subgraphs of the web graph with 3n nodes.at n=5A286187
• Numbers n=2*k-1 where Sum_{j=1..k} (-1)^(j+1) * d(2*j-1) achieves a new record, with d(n) = number of divisors of n (A000005).at n=21A318737