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Search: id:A117581
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| A117581 |
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For each successive prime p, the largest integer n such that both n and n-1 factor into primes less than or equal to p. By a theorem of Stormer, the number of such integers is finite; moreover he provides an algorithm for finding the complete list. |
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2
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| 2, 9, 81, 4375, 9801, 123201, 336141, 11859211, 11859211, 177182721, 1611308700, 3463200000, 63927525376, 421138799640, 1109496723126, 1453579866025, 20628591204481, 31887350832897, 31887350832897, 119089041053697
(list; graph; listen)
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