A278169 - OEIS

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A278169

Characteristic function for A000960.

1, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1

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OFFSET

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..9889

Index entries for characteristic functions

FORMULA

a(1) = 1; for n > 1, a(n) = A100617(n) - A100617(n-1).

MATHEMATICA

b[n_] := (For[m = n; i = 1, i <= n-1, i++, d = n-i; m = d*Ceiling[m/d+1]]; m); A000960 = Array[b, 12]; Boole[MemberQ[A000960, #]]& /@ Range[A000960 // Last] (* Jean-François Alcover, Nov 24 2016 *)

PROG

(Scheme) (define (A278169 n) (if (= 1 n) n (- (A100617 n) (A100617 (- n 1)))))

CROSSREFS

Characteristic function of A000960.

Cf. A100617 (partial sums).

Sequence in context: A355943 A102242 A005369 * A262693 A267423 A108340

Adjacent sequences: A278166 A278167 A278168 * A278170 A278171 A278172

KEYWORD

nonn

AUTHOR

Antti Karttunen, Nov 23 2016

STATUS

approved