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A208768
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The distinct values of A070198.
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4
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0, 1, 5, 11, 59, 419, 839, 2519, 27719, 360359, 720719, 12252239, 232792559, 5354228879, 26771144399, 80313433199, 2329089562799, 72201776446799, 144403552893599, 5342931457063199, 219060189739591199, 9419588158802421599, 442720643463713815199
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OFFSET
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1,3
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COMMENTS
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The terms of A070198, and duplicates removed.
Factorizations:
5, 11, 59, 419, 839 are primes;
2519 = 11*229, 27719 = 53*523, 360359 = 173*2083,
720719 = 31*67*347, 12252239 = 29*647*653;
232792559, 5354228879 are primes;
26771144399 = 47*12907*44131, 80313433199 = 29*61*45400471;
2329089562799 is prime;
72201776446799 = 37*149*239*1091*50227;
144403552893599 is prime;
Very likely contains an infinite number of primes (see A057824). (End)
A more natural (compare with A051452) name for the sequence: lcm(1, ..., k) - 1, where k is the n-th prime power A000961(n). - Daniel Forgues, May 09 2014
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LINKS
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PROG
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(Haskell)
import Data.List (nub)
a208768 n = a208768_list !! (n-1)
a208768_list = nub a070198_list
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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