Math problem with inspiration from the OEIS

[Jaap Spies]

Dear Seqfans,

The Dutch Math Journal 'Nieuw Archief voor Wiskunde' has a Problem Section.
Once in a time there is a so called Star Problem, which is mostly an open
problem. Solutions are welcome in the year after publication, see:

http://www.math.leidenuniv.nl/%7Enaw/home/ps/pdf/problemen-mrt07-flyer-eng.pdf

Inspired by the comment by Farideh Firoozbakht:

http://www.research.att.com/~njas/sequences/A055234


Have fun,

Jaap