03/06/2014       COMPETITION CLOSED: 3 pairs of tickets up for grabs for my Sunday Cheltenham talk on “The Simpsons & Their Mathematical Secrets”

Question:

Which decagonal number, which is also sphenic, regularly appears in The Simpsons?

Answer:

742 (Evergreen Terrace), i.e., the house number of the Simpson family.

The competition was open until midnight, today, June 4. Competition now closed.