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Search: id:A057663
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| A057663 |
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Primes p such that p+2^p is also a prime. |
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4
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OFFSET
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1,1
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COMMENT
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Different from A056206, where e.g. at n=89, 89 is not minimal, A056206(89)=29 and not 89.
a(6) > 27479 - Ralf Stephan (ralf(AT)ark.in-berlin.de), Oct 23 2002
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EXAMPLE
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q=3, 2^3+3 = 11 a prime.
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PROGRAM
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(PARI) \ p^q + q is prime q is prime ptoqpq2(p, n)= { local(x, y, q); for(x=1, n, q=prime(x); y=p^q+q; if(ispseudoprime(y), print1(q", ")) ) } (Cino Hilliard)
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CROSSREFS
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Cf. A056206, A056208, A057664, A057665.
Sequence in context: A062214 A107655 A133660 this_sequence A056244 A103081 A003112
Adjacent sequences: A057660 A057661 A057662 this_sequence A057664 A057665 A057666
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Oct 16 2000
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