524649

Appears in sequences

• a(n) = 2^n + n^2.at n=19A001580
• 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=39A076980
• Numbers of the form p^2 + 2^p for p prime.at n=7A097058
• Numbers of the form x^y + y^x, 1 < x < y.at n=33A173054
• Numbers of the form a^b+b^a, a and b are primes.at n=13A173056
• a(n) = Sum_{p|n, p prime} p^sopf(n/p).at n=37A369912
• Expansion of Sum_{p prime} p * x^p / (1 - p * x^p).at n=37A382513
• 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=43A385232