Not Every Number is the Sum or Difference of Two Prime Powers
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What is to be demonstrated is that there exist odd integers which cannot be expressed as $2^m \pm q^n$.
- 1975: Frederick R. Cohen and J.L. Selfridge: Not Every Number is the Sum or Difference of Two Prime Powers (Math. Comp. Vol. 29, no. 129: pp. 79 – 81) www.jstor.org/stable/2005463