91293domain: NAppears in sequencesTribonacci numbers: a(n) = a(n-1) + a(n-2) + a(n-3), with a(0) = 1, a(1) = 1, a(2) = 0.at n=21A081172Positions at which the sum of the digits of e up to that point equals the sum of the digits of Pi up to that point.at n=29A131660