OFFSET
1,2
COMMENTS
The structure of the stepped pyramid arises after the 90-degree-zig-zag folding of the diagram of the isosceles triangle A237593.
The terraces at the k-th level of the pyramid are also the parts of the symmetric representation of sigma(k), k >= 1.
The stepped pyramid is also one of the 3D-quadrants of the stepped pyramid described in A244050.
Is this sequence infinite?
LINKS
EXAMPLE
a(3) = 9 because descending by the main diagonal of the pyramid, the height difference between the level 9 and the level of the next terrace is equal to 3, and 9 is the smallest number with this property.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Omar E. Pol, Dec 31 2016
EXTENSIONS
a(6) from Omar E. Pol, Jan 02 2017
STATUS
approved