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A084404 Numbers n such that n#*2^n+1 is prime, where n# = product of primes <= n. 0
1, 4, 7, 20, 22, 27, 32, 37, 48, 68, 122, 128, 148, 152, 155, 159, 160, 198, 216, 217, 239, 247, 248, 306, 363, 429, 475, 515, 606, 651, 823, 1491, 1774, 1923, 2153, 2469, 2838, 2891, 2944, 3015, 3032, 3242, 3594, 4896, 5458, 5491, 5913, 6030 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
The values 1491 through 6030 have been proved prime; 6030#*2^6030+1 has 4386 decimal digits.
LINKS
OpenPFGW Project, Primality Tester.
CROSSREFS
Cf. A034386.
Sequence in context: A045548 A359733 A090879 * A147065 A049947 A266822
KEYWORD
nonn
AUTHOR
Jason Earls, Jun 24 2003
STATUS
approved

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Last modified May 28 01:06 EDT 2024. Contains 372900 sequences. (Running on oeis4.)