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A188641
Characteristic function of Niven (or Harshad) numbers.
8
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 1, 1, 0, 1, 0, 0, 1, 0, 0, 1
OFFSET
1
COMMENTS
a(A005349(n)) = 1; a(A065877(n)) = 0;
also a(A038186(n)) = 1.
FORMULA
a(n) = A000007(A070635(n)).
PROG
(Haskell)
a188641 = (1 -) . signum . a070635
CROSSREFS
Sequence in context: A202022 A136522 A352871 * A086299 A131364 A152066
KEYWORD
nonn,base
AUTHOR
Reinhard Zumkeller, Apr 07 2011
STATUS
approved