1275125

Appears in sequences

• Numbers k such that k | 4^k + 1.at n=32A015950
• Numbers k such that k | 9^k + 1.at n=25A015957
• Numbers k that divide 4^k + 1, k not a power of 5.at n=23A015974
• Numbers k such that core(k+1) = core(k)+1 and k is not squarefree, where core(k) = A007913(k).at n=20A260198
• a(0)=0, a(1)=5 and a(n) = 22*a(n-1) - a(n-2) + 10 for n > 1.at n=5A322707
• a(n) = n * (16*n^2+20*n+5)^2.at n=5A322745
• a(n) = 1/2 * (-1 + Sum_{k=0..n} binomial(2*n,2*k)*(n+1)^(n-k)*n^k).at n=5A322746