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A104298
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a(n) = prime((a(n-1) + 1)/2), a(1)=15.
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3
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15, 19, 29, 47, 89, 197, 523, 1667, 6397, 29437, 160423, 1023227, 7552957, 63845779, 612095179, 6597973097, 79345496843, 1057111639847, 15505433597669
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OFFSET
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1,1
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COMMENTS
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All primes except a(1) which is any odd integer; 15 is first a(n) missing in A104296; various a(1)'s A104296-A104304.
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LINKS
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MATHEMATICA
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a[1] = 15; a[n_] := a[n] = Prime[(a[n - 1] + 1)/2]; Table[ a[n], {n, 19}] (* Robert G. Wilson v, Mar 24 2005 *)
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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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