1572858

Appears in sequences

• Start with a single triangle; at n-th generation add a triangle at each vertex, allowing triangles to overlap; sequence gives number of triangles in n-th generation.at n=36A061776
• a(1) = 1; thereafter a(n) = 6*(2^(n-1) - 1).at n=18A068293
• Numbers n which when converted to base 8, reversed and converted back to base 10 yield a number m such that n mod m = 0. Cases which are trivial or result in digit loss are excluded.at n=25A091082
• n*Jacobsthal(n).at n=18A093835
• First differences of A158916.at n=20A158926
• Base-10 representation of numbers k which, in base 2, satisfy abs(k + reverse(k) - reverse(k + reverse(k))) = abs(k - reverse(k)) + reverse(abs(k - reverse(k))) = k.at n=30A179697