The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 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 Table of n, a(n) for n=1..48. OpenPFGW Project, Primality Tester. CROSSREFS Cf. A034386. Sequence in context: A045548 A359733 A090879 * A147065 A049947 A266822 Adjacent sequences: A084401 A084402 A084403 * A084405 A084406 A084407 KEYWORD nonn AUTHOR Jason Earls, Jun 24 2003 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

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