268705

Appears in sequences

• a(n) = 4^n + n^4.at n=9A001589
• Leyland numbers: 3, together with numbers expressible as n^k + k^n nontrivially, i.e., n,k > 1 (to avoid n = (n-1)^1 + 1^(n-1)).at n=36A076980
• a(n) = 3^n + 2*n*4^(n-1).at n=8A086093
• Triangle read by rows: T(n,r) = n^r + r^n (1 <= r <= n).at n=39A093898
• Numbers of the form x^y + y^x, 1 < x < y.at n=30A173054
• a(n) = n^9 + 9^n.at n=4A185277
• Numbers of the form 8^j + 9^k, for j and k >= 0.at n=40A226832
• Numbers that can be written as s^x + t^y, with 1 < s < t and {s,t} = {x,y}; that is, are of the form s^s + t^t or s^t + t^s.at n=40A385232