1618409domain: NAppears in sequencesPositive integers n such that all the gaps prime(n+i+1) - prime(n+i) (i = 0..5) are triangular numbers.at n=9A244254Growth of the Lamplighter group: number of elements in the Lamplighter group L_2 = Z/2Z wr Z of length up to n with respect to the standard generating set {a,t}.at n=24A294683