The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A035033 Numbers k such that k <= d(k)^2, where d() = number of divisors (A000005). 19
 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 Table of n, a(n) for n=1..54. 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 * A054219 A196277 A368385 Adjacent sequences: A035030 A035031 A035032 * A035034 A035035 A035036 KEYWORD nonn,fini,full AUTHOR Erich Friedman, Labos Elemer STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified August 10 15:36 EDT 2024. Contains 375056 sequences. (Running on oeis4.)