Nivenmorphic Numbers
A Nivenmorphic number or Harshadmorphic number for a given number base is an integer t such that there exists some Harshad number N whose digit sum is t, and t, written in that base, terminates N written in the same base.
For example, 18 is a Nivenmorphic number for base 10:
16218 is a Harshad number 16218 has 18 as digit sum 18 terminates 16218Sandro Boscaro determined that for base 10 all positive integers are Nivenmorphic numbers except 11.
Read more about this topic: Harshad Number
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“What culture lacks is the taste for anonymous, innumerable germination. Culture is smitten with counting and measuring; it feels out of place and uncomfortable with the innumerable; its efforts tend, on the contrary, to limit the numbers in all domains; it tries to count on its fingers.”
—Jean Dubuffet (1901–1985)