OFFSET
1,5
COMMENTS
a(n) is also the number of columns without ON square cells in the ziggurat diagram of n. Both diagrams can be unified in a three-dimensional version.
a(n) is also the number of zeros in the n-th row of A249351.
The number of widths in the symmetric representation of sigma(n) is equal to 2*n - 1 = A005408(n-1).
The sum of the widths of the symmetric representation of sigma(n) equals A000203(n).
a(n) = 0, if and only if A237271(n) = 1.
a(p) = p - 2, if p is prime.
For the definition of "width" see A249351.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Omar E. Pol, Aug 29 2021
STATUS
approved