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A057825 Values of k for which A003418(k) - 1 is prime. 4
3, 4, 5, 6, 7, 8, 19, 20, 21, 22, 23, 24, 29, 30, 32, 33, 34, 35, 36, 47, 48, 61, 62, 63, 97, 98, 99, 100, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 233, 234, 235, 236, 237, 238, 307, 308, 309, 310, 401, 402, 403, 404, 405, 406, 407, 408, 887, 888, 889, 890 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Fewer distinct primes than distinct values of a(n) are generated. So, e.g., k = 97, 98, 99, 100 all correspond to lcm([1..97]) - 1 = 69720375229712477164533808935312303556799, a prime.
LINKS
PROG
(PARI) isok(k) = ispseudoprime(lcm(vector(k, i, i))-1); \\ Jinyuan Wang, May 02 2020
CROSSREFS
Sequence in context: A039084 A277641 A085627 * A082464 A037349 A037350
KEYWORD
nonn
AUTHOR
Labos Elemer, Nov 08 2000
STATUS
approved

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Last modified March 19 06:05 EDT 2024. Contains 370952 sequences. (Running on oeis4.)