Search: id:a068535
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A068535
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Numbers k such that 2^k mod k = 2^k mod k^2.
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+0
4
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1, 2, 4, 8, 16, 32, 35, 64, 128, 256, 297, 512, 1024, 1093, 2048, 2186, 2590, 3279, 3511, 4096, 4372, 5465, 6558, 7022, 7651, 8192, 8744, 9837, 10533, 10930, 13116, 14044, 14209, 16384, 21066, 23175, 24012, 24577, 26592, 28088, 31599, 32768, 35110, 38621, 42132
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OFFSET
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1,2
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COMMENTS
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Sequence contains all numbers of the form 2^k (A000079) but also many others as the subsequence of primes in A001220.
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LINKS
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MATHEMATICA
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Select[Range[33000], PowerMod[2, #, #]==PowerMod[2, #, #^2]&] (* Harvey P. Dale, Oct 29 2017 *)
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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