234257

Appears in sequences

• a(n) = n^4 + 1.at n=22A002523
• Write n as Product_{i=1..k} prime(i)^e_i, where prime(i) is the i-th prime number and e_i is a nonnegative integer. a(n) = Sum_{i=1..k} e_i*n^(i-1).at n=21A090883
• a(1)=0, a(n) is the smallest nonprime > (n-1)^smallest digit of a(n-1).at n=22A158320
• Semiprimes of the form n^4 + 1.at n=12A186688
• Weak Goodstein numbers: a(n) = g_n(n), where g_n(n) is the weak Goodstein function.at n=20A266202
• Composite numbers m such that for any positive integers a < b, if a * b = m then b - a is a perfect square.at n=4A268585
• If n = Product (p_j^k_j) then a(n) = Sum (n^(pi(p_j) - 1)), where pi = A000720.at n=21A332411
• a(n) = Sum_{d|n} phi(d)^4.at n=22A342470
• a(n) = Sum_{k=0..n} binomial(n,k) * binomial(2*n+4*k,k).at n=5A388727