51179

Appears in sequences

• Number of planar n X n X n binary triangular grids symmetric both under 120-degree rotation and reflection with no more than 1 one in any 4 X 4 X 4 subtriangle.at n=29A153904
• Numbers k such that 13*10^k + 1 is prime.at n=17A289051
• Numbers k such that (k + k')' = k' + k'', where ' denotes the arithmetic derivative A003415.at n=15A376844