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 A228520 a(n) is the smallest number such that if x >= a(n), then pi^*(x) - pi^*(x/2) >= n, where pi^*(x) is the number of  terms of A050376 <= x. 6
 2, 3, 11, 16, 23, 41, 47, 59, 67, 71, 79, 101, 107, 109, 127, 149, 167, 169, 179, 181, 227, 229, 233, 239, 256, 263, 269, 281, 283, 307, 347, 349, 359, 367, 373, 401, 409, 419, 431, 433, 439, 461, 487, 491, 521, 569, 587, 593, 599, 601, 607, 617, 641, 643, 647 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The sequence is a Fermi-Dirac analog of Ramanujan numbers (A104272), since terms of A050376 play a role of primes in Fermi-Dirac arithmetic (see comments in A050376). LINKS Peter J. C. Moses, Table of n, a(n) for n = 1..10000 FORMULA a(n)<= R_n, where R_n is the n-th Ramanujan number (A104272); a(n)~A000040(2*n) as n goes to infinity. CROSSREFS Cf. A104272. Sequence in context: A194558 A076514 A071012 * A280969 A349565 A091734 Adjacent sequences:  A228517 A228518 A228519 * A228521 A228522 A228523 KEYWORD nonn AUTHOR Vladimir Shevelev, Aug 24 2013 EXTENSIONS More terms from Peter J. C. Moses STATUS approved

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Last modified May 24 11:04 EDT 2022. Contains 354033 sequences. (Running on oeis4.)