124215

Appears in sequences

• Triangle read by rows: T(n, k) = binomial(2*n+1, n-k)^2*(2*k+1)/(2*n+1).at n=32A067802
• First differences of triangular numbers with square pyramidal indices.at n=12A077538
• Column 4 of triangle A123610.at n=11A123614
• Triangle of numerators of the coefficients t(n,k) in the formula B(2n) = -sum_{k=1..n-1} t(n,k)*B(2k)*B(2n-2k), where the B() are the even-indexed Bernoulli numbers.at n=20A228969
• Numbers for which the number of prime divisors counted with multiplicity and the sum of the distinct prime divisors are both perfect.at n=32A233563
• Composite numbers n such that the sum of proper divisors of n divides 2^n+1.at n=23A278337