> Riesel numbers form arithmetic progressions with common difference

Technical quibbles:

> equal to the product of the primes in the covering set.

> For example, 509203 + b*(3*5*7*13*17*241) is a Riesel number for any b.

1) The above applies to Riesel numbers with a finite covering set.

I think it's unknown whether this is all Riesel numbers.

2) Riesel numbers are odd by definition so throw in a factor 2 in

the common difference.

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Jens Kruse Andersen