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A127998
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Numbers n such that (24^n - 1)/23 is prime.
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10
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3, 5, 19, 53, 71, 653, 661, 10343, 49307, 115597, 152783
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OFFSET
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1,1
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COMMENTS
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Note that 10343 was known to be a term of this sequence before 653 and 661. - Alonso del Arte, Mar 17 2014
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LINKS
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MATHEMATICA
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Select[Prime[Range[100]], PrimeQ[(24^# - 1)/23] &]
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PROG
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(PARI) isok(n) = isprime((24^n-1)/23); \\ Michel Marcus, Mar 13 2016
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CROSSREFS
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KEYWORD
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hard,more,nonn
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AUTHOR
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EXTENSIONS
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a(6) and a(7) from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 05 2008
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STATUS
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approved
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