19778

Appears in sequences

• s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = (odd natural numbers), t = A001950 (upper Wythoff sequence).at n=34A024600
• Numbers k such that sopf(k) = sopf(k+2), where sopf(k) = A008472(k).at n=18A063968
• Numbers n of the form k + reverse(k) for exactly three k.at n=38A071914
• Indices of primes in sequence defined by A(0) = 31, A(n) = 10*A(n-1) + 11 for n > 0.at n=10A101828
• Multiples of 682.at n=29A200860
• Expansion of Product_{k>=0} (1 + x^(4*k+1))^(4*k+1).at n=41A285288
• Table read by rows: T(n, k) is the number of permutations of size n whose incidence graph has treewidth k.at n=35A368500
• Squarefree numbers k such that k^2 is abundant, and d^2 is nonabundant for any proper divisor d of k.at n=36A381741