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Base 17:
Covering set every 4 n, [3,5,29]. Sierpinski value of 278, the following candidates need a prime 88,92,160,244,262. On the Riesel side, the lowest is conjectured to be 86, with only k=44 needing to find a prime.

Quote:
Originally Posted by jasong
Edit: 92*17^41 trivially factors prime!: 7683931

A prime is needed for 92*17^n+1.