6225920

Appears in sequences

• a(1) = 4; a(n) = smallest composite number greater than the sum of all previous terms.at n=21A070232
• Exponential Riordan array [sec(2x), arctanh(tan(x))].at n=46A166317
• Exponential Riordan array [sech(2x), arctan(tanh(x))].at n=46A166318
• a(n) is the smallest number which can be represented as the sum of n n-almost primes in exactly n ways, or -1 if no such number exists.at n=17A365493