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Search: id:A118782
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| A118782 |
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Numbers n such that closest primes surrounding 10^n have the same last digit. |
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+0
1
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| 6, 9, 12, 19, 20, 23, 28, 31, 32, 33, 39, 59, 62, 66, 67, 75, 79, 80, 83, 84, 85, 91, 98, 99, 107, 108, 109, 117, 121, 144, 147, 149, 150, 153, 155, 156, 159, 160, 167, 169, 178, 179, 184, 186, 187, 191, 195, 208, 210, 212, 220, 222, 226, 227, 229, 231, 242, 246
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Do these numbers continue to infinity?
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EXAMPLE
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999983 and 1000003 are the closest primes surrounding 10^6. they both have the
same last digit so 6 is in the table.
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PROGRAM
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(PARI) g(n) = for(j=1, n, x=precprime(10^j); y=nextprime(10^j); if(x%10==y%10, print1(j", ")))
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CROSSREFS
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Sequence in context: A114554 A023386 A036999 this_sequence A106218 A118521 A095213
Adjacent sequences: A118779 A118780 A118781 this_sequence A118783 A118784 A118785
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KEYWORD
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easy,nonn,base,less
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AUTHOR
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Cino Hilliard (hillcino368(AT)gmail.com), May 22 2006
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