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A256356
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Composites in base 10 that remain composite in exactly two bases b, 2 <= b <= 10, expansions interpreted as decimal numbers.
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7
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33247243, 64037779, 104865433, 130237003, 238561081, 550677781, 947051353, 1013991553, 1246382791, 1343122201, 1607697631, 1609062751, 1632753601, 1788658063, 2203645111, 2364166213, 2393866411, 2480419783, 2518589671, 2544177511, 2668538575, 3029334883
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OFFSET
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1,1
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COMMENTS
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Are there any remaining composites in only one other base?
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LINKS
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CROSSREFS
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KEYWORD
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nonn,base,hard,changed
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AUTHOR
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STATUS
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approved
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