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Search: id:A057678
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| A057678 |
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Primes of the form 2^p - p where p is prime. |
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+0
6
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OFFSET
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1,1
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COMMENT
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Next term, if it exists, has more than 618 digits. - Emeric Deutsch (deutsch(AT)duke.poly.edu), Mar 27 2005
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MAPLE
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a:=proc(n) if isprime(2^ithprime(n)-ithprime(n))=true then 2^ithprime(n)-ithprime(n) else fi end: seq(a(n), n=1..310); (Deutsch)
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MATHEMATICA
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lst={}; Do[p=Prime[n]; If[PrimeQ[p=2^p-p], AppendTo[lst, p]], {n, 5!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Jan 28 2009]
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CROSSREFS
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Cf. A057663-A057665, A056677.
Sequence in context: A082973 A082815 A115893 this_sequence A090071 A139062 A122760
Adjacent sequences: A057675 A057676 A057677 this_sequence A057679 A057680 A057681
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KEYWORD
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more,nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Oct 19 2000
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