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 A035033 Numbers n such that n <= d(n)^2, where d() = number of divisors (A000005). 18
 1, 2, 3, 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 24, 28, 30, 32, 36, 40, 42, 48, 54, 56, 60, 72, 80, 84, 90, 96, 108, 120, 126, 132, 140, 144, 168, 180, 192, 210, 216, 240, 252, 288, 300, 336, 360, 420, 480, 504, 540, 720, 840, 1260 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS MATHEMATICA Select[Range[1300], #<=DivisorSigma[0, #]^2&] (* Harvey P. Dale, Mar 16 2012 *) PROG (PARI) is(n)=numdiv(n)^2>=n \\ Charles R Greathouse IV, Aug 03 2012 CROSSREFS Cf. A000005, A035034, A035035, A033950, A036763, A034884, A273323. Sequence in context: A225730 A256389 A225729 * A054220 A196277 A280196 Adjacent sequences:  A035030 A035031 A035032 * A035034 A035035 A035036 KEYWORD nonn,fini,full AUTHOR STATUS approved

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Last modified February 24 06:13 EST 2020. Contains 332199 sequences. (Running on oeis4.)