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A046843
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Numbers k such that k*2^k - k - 1 is prime.
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2
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2, 4, 8, 12, 16, 40, 80, 314, 478, 604, 634, 790, 868, 1264, 1376, 2536, 3544, 6564, 7268, 7780, 8366, 15010, 16636, 18672, 27084, 29954, 51968, 60940
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OFFSET
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1,1
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COMMENTS
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The corresponding primes are given in A046842.
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LINKS
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MAPLE
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MATHEMATICA
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Select[Range[10000], PrimeQ[# 2^#-#-1]&] (* Harvey P. Dale, Oct 10 2011 *)
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PROG
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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