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 A234298 Ramanujan prime R_k such that pi(R_(k+1)) - pi(R_k) are record values: record Ramanujan prime A190874(k). 1
 2, 71, 181, 503, 2531, 5273, 9887, 11587, 55339, 174917, 225961, 534883, 2492311, 5409337, 130449773, 141833603, 212583797, 658046911, 1183597123, 2897211971, 5602581277, 46992178547, 70637059291, 158465541049, 182591976709, 339683208863 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS These are the primes preceding the unique values of A174641.  That sequence is the start of a run of non-Ramanujan primes, so the previous prime is the Ramanujan prime. - Dana Jacobsen, Jul 14 2016 LINKS PROG (Perl) perl -Mntheory=:all -nE 'my \$n = \$1 if /(\d+)\$/; say ++\$x, " ", prev_prime(\$n) unless \$seen{\$n}++; ' b174641.txt  # Dana Jacobsen, Jul 14 2016 (Perl) use ntheory ":all"; my(\$max, \$r)=(0, ramanujan_primes(1e7)); for (0..\$#\$r-1) { my \$d=prime_count(\$r->[\$_+1])-prime_count(\$r->[\$_]); if (\$d > \$max) { say \$r->[\$_]; \$max=\$d; } } # Dana Jacobsen, Jul 14 2016 CROSSREFS Record values are in A202186, index of A190874 at record terms in A202187, A202188 is the index of A168425 when A174641(n) = A168425(m); A202188(n) = m. A202187 is also the index of a(n). Sequence in context: A293753 A164554 A141908 * A157368 A095935 A202813 Adjacent sequences:  A234295 A234296 A234297 * A234299 A234300 A234301 KEYWORD nonn AUTHOR John W. Nicholson, Dec 22 2013 EXTENSIONS a(20) to a(26) from Dana Jacobsen, Jul 14 2016 STATUS approved

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Last modified September 30 12:21 EDT 2020. Contains 337439 sequences. (Running on oeis4.)