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Sequence of the Day for September 23

A005231: Odd abundant numbers.

{ 945, 1575, 2205, 2835, 3465, 4095, 4725, ... }

Yes, the very first abundant number to be odd is 945, the 232nd abundant number! The first abundant number is even, namely, 12.


No, the odd abundant numbers are not all divisible by 3 or 5, e.g.

  • The first odd abundant number not divisible by 5 is 81081, this being the 175th odd abundant number (and the ?th abundant number).
  • The first odd abundant number not divisible by 3 is 5391411025, this being the ?th odd abundant number (and the ?th abundant number).
  • The first odd abundant number not divisible by neither 3 nor 5 is 20169691981106018776756331, this being the ?th odd abundant number (and the ?th abundant number).

Usage

Add {{Sequence of the Day/today}} at the beginning of a line where you want to insert today's Sequence of the Day as XHTML <h2></h2> section for Wiki markup ==== rendered without edit link. The fallback {{Sequence of the Day for February 30}} indicates a missing sequence of the day if not even a draft exists.

Use {{Sequence of the Day/today|LOCAL}} to show the sequence of the day for {{LOCALMONTHNAME}} {{LOCALDAY}} in the local EST or EDT timezone of the oeis.org server, otherwise {{CURRENTMONTHNAME}} {{CURRENTDAY}} results in UTC dates.