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 A294934 Characteristic function for deficient numbers (A005100): a(n) = 1 if A001065(n) < n, 0 otherwise. 17
 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 0 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1 LINKS Antti Karttunen, Table of n, a(n) for n = 1..65537 FORMULA a(n) = 1 if A033879(n) > 0, 0 otherwise. a(n) = 1 - A294936(n). a(n) = 1 - sign(floor(sigma(n)/(2*n))), where sigma is the sum of the divisors of n (A000203). - Wesley Ivan Hurt, Oct 01 2020 MATHEMATICA Table[1 - Sign[Floor[DivisorSigma[1, n]/(2 n)]], {n, 100}] (* Wesley Ivan Hurt, Oct 02 2020 *) CROSSREFS Cf. A001065, A033879, A294935, A294936, A294937. Cf. A005100 (positions of 1's), A023196 (of 0's). Cf. A000203 (sigma). Sequence in context: A345009 A071040 A336834 * A174340 A300294 A071041 Adjacent sequences:  A294931 A294932 A294933 * A294935 A294936 A294937 KEYWORD nonn,easy AUTHOR Antti Karttunen, Nov 12 2017 STATUS approved

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Last modified August 5 18:22 EDT 2021. Contains 346488 sequences. (Running on oeis4.)