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A128946
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Numbers n such that the largest prime < 10^n is a twin prime member.
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0
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OFFSET
| 1,2
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COMMENTS
| A003618(a(n)) is in A001097 (Twin primes).
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EXAMPLE
| For n=1, 10^1 = 10. 7, the greatest prime < 10, is a member of the twin prime pair 5,7.
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PROG
| (PARI) g(n)=for(x=1, n, y=precprime(10^x); if(ispseudoprime(y-2), print1(x", ")))
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CROSSREFS
| Sequence in context: A070135 A067857 A027832 * A156219 A000331 A082269
Adjacent sequences: A128943 A128944 A128945 * A128947 A128948 A128949
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KEYWORD
| hard,more,nonn
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AUTHOR
| Cino Hilliard (hillcino368(AT)hotmail.com), Apr 28 2007
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EXTENSIONS
| Edited by Ray Chandler (rayjchandler(AT)sbcglobal.net), May 12 2007
a(5), a(6) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Feb 21 2008
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