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0, -7, -84, -855, -7986, -64455, -287568, 5666105, 276309378, 8888888889, 274200559500, 8804989337145, 301763995481142, 11100895714446905, 437782779269748264, 18445632962598440505, 827229150775225653066
(list;
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listen;
history;
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internal format)
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OFFSET
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1,2
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COMMENTS
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20^20-11111111111111111111=104857588888888888888888889 is the only known prime term of this sequence. Next such prime has more than 40000 digits (n>10000)!
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LINKS
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FORMULA
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EXAMPLE
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a(2) = 2^2-11 = -7, a(8) = 8^8-11111111 = 5666105.
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MAPLE
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MATHEMATICA
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Table[n^n - (10^n - 1)/9, {n, 17}]
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CROSSREFS
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KEYWORD
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easy,sign,base
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AUTHOR
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Ali Heydarian (mymontain(AT)yahoo.com), May 13 2010
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STATUS
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approved
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