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A108687
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Numbers of the form (9^i)*(11^j), with i, j >= 0.
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4
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1, 9, 11, 81, 99, 121, 729, 891, 1089, 1331, 6561, 8019, 9801, 11979, 14641, 59049, 72171, 88209, 107811, 131769, 161051, 531441, 649539, 793881, 970299, 1185921, 1449459, 1771561, 4782969, 5845851, 7144929, 8732691, 10673289, 13045131
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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MATHEMATICA
| f[upto_]:=With[{max9=Floor[Log[9, upto]], max11=Floor[Log[11, upto]]}, Select[Union[Times@@{9^First[#], 11^Last[#]}&/@Tuples[{Range[0, max9], Range[0, max11]}]], #<=upto&]]; f[14000000] (* From Harvey P. Dale, Mar 11 2011 *)
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CROSSREFS
| Cf. A025633, A025634, A107788, A107764, A003596, A003597, A107988, A003598, A003599, A108090.
Sequence in context: A116152 A195941 A195992 * A038301 A137016 A053886
Adjacent sequences: A108684 A108685 A108686 * A108688 A108689 A108690
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KEYWORD
| nonn
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AUTHOR
| Douglas Winston (douglas.winston(AT)srupc.com), Jun 17 2005
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