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Just showing those entries submitted by 'Andersen': (Click here to show all) The start of a prime quadruplet such that the sum of any three is prime. The four sums produce a second prime quadruplet starting at 2971133294674541. The sum of any three of those produce a third prime quadruplet starting at 8913399884023631. This is the smallest such quadruplet chain. [Andersen]
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