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A025715
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Index of 6^n in A025622 (numbers of form 5^i*6^j).
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2
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1, 3, 6, 10, 15, 21, 28, 36, 45, 56, 68, 81, 95, 110, 126, 143, 161, 180, 201, 223, 246, 270, 295, 321, 348, 376, 405, 436, 468, 501, 535, 570, 606, 643, 681, 720, 761, 803, 846, 890, 935, 981, 1028, 1076, 1125, 1176, 1228, 1281, 1335, 1390, 1446, 1503, 1561, 1621
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OFFSET
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0,2
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LINKS
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FORMULA
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PROG
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(PARI) lista(nn) = {v = []; for (n=0, nn, for (m = 0, nn, v = vecsort(concat(v, 5^n*6^m), , 8); ); ); n=0; for (k=1, #v, vk = v[k]; if ((valuation(vk, 6)==n) && (valuation(vk, 5) == 0), if (vk > 5^(nn+1), return(), print1(k, ", "); n++); ); ); } \\ Michel Marcus, Sep 28 2015
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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