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Search: id:A133834
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| A133834 |
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Numbers n such that primorial(n)^4 + 1 is prime. |
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+0
1
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OFFSET
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1,2
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COMMENT
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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
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As primorial(2)^4 + 1 = (3*2)^4 + 1 = 1297 is prime, 2 is a term.
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CROSSREFS
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Cf. A092061.
Sequence in context: A110130 A019025 A018279 this_sequence A009313 A009317 A081680
Adjacent sequences: A133831 A133832 A133833 this_sequence A133835 A133836 A133837
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KEYWORD
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hard,nonn
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AUTHOR
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Rick L. Shepherd (rshepherd2(AT)hotmail.com), Sep 26 2007
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