53922

Appears in sequences

• Hexagonal pyramidal numbers, or greengrocer's numbers.at n=43A002412
• Even hexagonal pyramidal numbers.at n=20A015226
• Base 7 digits are, in order, the first n terms of the periodic sequence with initial period 3,1.at n=5A037586
• a(n) = 2025*n^2 - 3401*n + 1428.at n=5A156854
• Least solution of the equation x' = x + p for increasing values of p, where x' is the arithmetic derivative of x and p is an odd prime. a(n)= -1 if no such solution exists.at n=2A258336
• G.f.: Sum_{k>=0} x^(k*(k+1)/2) * Product_{j=1..k} 1/(1 - x^j)^3.at n=24A376707
• Square array A(n,k), n >= 0, k >= 0, read by antidiagonals downwards, where column k is the expansion of B(x)^k, where B(x) is the g.f. of A384622.at n=41A384623