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Search: id:A128942
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| A128942 |
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Numbers n such that the next prime exceeding 10^n is a twin prime member. |
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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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A003617(a(n)) is in A001097 (Twin primes).
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EXAMPLE
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For n=2, 10^2 = 100. The first prime > 100 is 101 which is a member of the twin prime pair 101,103.
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PROGRAM
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(PARI) g(n)=for(x=1, n, y=nextprime(10^x); if(ispseudoprime(y+2), print1(x", ")))
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CROSSREFS
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Sequence in context: A162109 A067603 A065299 this_sequence A135445 A098556 A159585
Adjacent sequences: A128939 A128940 A128941 this_sequence A128943 A128944 A128945
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KEYWORD
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hard,more,nonn
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AUTHOR
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Cino Hilliard (hillcino368(AT)hotmail.com), Apr 28 2007
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EXTENSIONS
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Edited by Ray Chandler (rayjchandler(AT)sbcglobal.net), May 12 2007
a(6), a(7) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Feb 21 2008
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