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A193880
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0.75-Ramanujan primes R_{0.75,n}: a(n) is the smallest number such that for all x >= a(n), we have pi(x) - pi(0.75x) >= n, where pi(x) is the number of primes <= x.
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3
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11, 29, 59, 67, 101, 149, 157, 163, 191, 227, 269, 271, 307, 379, 383, 419, 431, 433, 443, 457, 563, 593, 601, 641, 643, 673, 701, 709, 733, 827, 829, 907, 937, 947, 971, 1019, 1033, 1039, 1051, 1087, 1187, 1193, 1217, 1277, 1427, 1429, 1433, 1481, 1483, 1487
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OFFSET
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1,1
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COMMENTS
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See comment to A193761. - Vladimir Shevelev, Aug 18 2011
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LINKS
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Table of n, a(n) for n=1..50.
N. Amersi, O. Beckwith, S. J. Miller, R. Ronan, J. Sondow, Generalized Ramanujan Primes
V. Shevelev, Ramanujan and Labos primes, their generalizations and classifications of primes
V. Shevelev, Ramanujan and Labos primes, their generalizations, and classifications of primes, J. Integer Seq. 15 (2012) Article 12.5.4
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FORMULA
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a(n) >= A104272(n)
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CROSSREFS
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Cf. A104272 Ramanujan primes, A193761 0.25-Ramanujan primes, A164952.
Sequence in context: A024846 A024842 A031072 * A138248 A021005 A054692
Adjacent sequences: A193877 A193878 A193879 * A193881 A193882 A193883
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KEYWORD
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nonn
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AUTHOR
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Nadine Amersi, Olivia Beckwith (obeckwith(AT)gmail.com), Steven J. Miller (Steven.J.Miller(AT)williams.edu), Ryan Ronan (ronan2(AT)cooper.edu), Jonathan Sondow, Aug 07 2011
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STATUS
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approved
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