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A193880 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. 3
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

See comment to A193761. - Vladimir Shevelev, Aug 18 2011

LINKS

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

FORMULA

a(n) >= A104272(n)

CROSSREFS

Cf. A104272 Ramanujan primes, A193761 0.25-Ramanujan primes, A164952.

Sequence in context: A024846 A024842 A031072 * A138248 A054692 A056256

Adjacent sequences:  A193877 A193878 A193879 * A193881 A193882 A193883

KEYWORD

nonn

AUTHOR

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

STATUS

approved

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Last modified April 24 09:00 EDT 2014. Contains 240957 sequences.