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A226832
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Numbers of the form 8^j + 9^k, for j and k >= 0.
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29
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2, 9, 10, 17, 65, 73, 82, 89, 145, 513, 521, 593, 730, 737, 793, 1241, 4097, 4105, 4177, 4825, 6562, 6569, 6625, 7073, 10657, 32769, 32777, 32849, 33497, 39329, 59050, 59057, 59113, 59561, 63145, 91817, 262145, 262153, 262225, 262873, 268705, 321193, 531442
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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a = 8; b = 9; mx = 600000; Union[Flatten[Table[a^n + b^m, {m, 0, Log[b, mx]}, {n, 0, Log[a, mx - b^m]}]]]
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PROG
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(PARI) ispowof(n, k)=k^valuation(n, k)==n
is(n)=if(n%8 != 1, return(ispowof(n-1, 9))); for(k=0, logint(n-1, 9), if(ispowof(n-9^k, 8), return(1))); 0 \\ Charles R Greathouse IV, Aug 29 2016
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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