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A018239
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Primorial primes: form product of first k primes and add 1, then reject unless prime.
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20
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2, 3, 7, 31, 211, 2311, 200560490131, 1719620105458406433483340568317543019584575635895742560438771105058321655238562613083979651479555788009994557822024565226932906295208262756822275663694111
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Prime numbers that are the sum of two primorial numbers. [From Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Nov 08 2010]
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REFERENCES
| F. Iacobescu, Smarandache Partition Type and Other Sequences, Bull. Pure Appl. Sciences, Vol. 16E, No. 2 (1997), pp. 237-240.
F. Smarandache, Sequences of Numbers Involved in Unsolved Problems, Hexis, Phoenix, 2006.
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LINKS
| M. Fleuren, Factors and primes of Smarandache sequences.
M. Fleuren, Smarandache Prime Product Sequence.
F. Smarandache, Sequences of Numbers Involved in Unsolved Problems.
R. Ondrejka, Primorial-Plus-One Primes
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MATHEMATICA
| Select[FoldList[Times, 1, Prime[Range[200]]] + 1, PrimeQ]. - Loreno Heer (helohe(AT)bluewin.ch), Jun 29 2004
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CROSSREFS
| Primes in A006862 (primorials plus 1).
A005234 and A014545 (which are the main entries for this sequence) give more terms.
Cf. A002110.
Sequence in context: A038710 A073918 A096350 * A066279 A057677 A032148
Adjacent sequences: A018236 A018237 A018238 * A018240 A018241 A018242
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KEYWORD
| nonn,nice
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AUTHOR
| Murray Bremner (bremner(AT)snoopy.usask.ca)
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EXTENSIONS
| Edited by N. J. A. Sloane (njas(AT)research.att.com) at the suggestion of Vladeta Jovovic, Jun 18 2007
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