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A133834
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Numbers n such that primorial(n)^4 + 1 is prime.
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0
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OFFSET
| 1,2
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COMMENTS
| Seven terms found and primes proved by PrimeForm ([N-1, Brillhart-Lehmer-Selfridge]). p(1282)#^4 + 1 has 18042 decimal digits. There are no more terms <= 2810.
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EXAMPLE
| As primorial(2)^4 + 1 = (3*2)^4 + 1 = 1297 is prime, 2 is a term.
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CROSSREFS
| Cf. A092061.
Sequence in context: A019025 A192332 A018279 * A203103 A173352 A009313
Adjacent sequences: A133831 A133832 A133833 * A133835 A133836 A133837
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KEYWORD
| hard,nonn
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AUTHOR
| Rick L. Shepherd (rshepherd2(AT)hotmail.com), Sep 26 2007
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