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A192823
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5-Ramanujan primes; the interval (x/2,x] has at least n 4-Ramanujan primes for x >= a(n) but not for x = a(n)-1.
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6
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1367, 1373, 1423, 1439, 2207, 2237, 3251, 3257, 3259, 3299, 5639, 8059, 12739, 12781, 12799, 12809, 12821, 12823, 12829, 12907, 12911, 12917, 12919, 12953, 13147, 13163, 13171, 13669, 13687, 13691, 13693, 14009, 14029, 14057, 14081, 14143, 31957, 32183
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OFFSET
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1,1
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COMMENTS
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It is conjectured that primepi(a(n)) < 50*n for large n. - T. D. Noe, Aug 26 2011
The sequence is only conjectural without a proof of an upper bound on a(n) (like the bound A104272(n) < prime(3*n) proved by Laishram and used in computing Ramanujan primes). - Jonathan Sondow, Aug 27 2011
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LINKS
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CROSSREFS
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KEYWORD
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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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