187393domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumbers that are the sum of 12 positive 11th powers.at n=18A004823a(n) = a(1) + a(2) + ... + a(n-1) - a(m) for n >= 4, where m = 2*n - 2 - 2^(p+1) and p is the unique integer such that 2^p < n - 1 <= 2^(p+1), starting with a(1) = a(2) = a(3) = 1.at n=21A049887Prime numbersat n=16955