This site is supported by donations to The OEIS Foundation.

 Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing. Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A214756 a(n) = largest Ramanujan prime R_k in A104272 that is <= A002386(n). 5
 2, 2, 2, 17, 71, 107, 503, 881, 1103, 1301, 9521, 15671, 19543, 31387, 155849, 360289, 370061, 492067, 1349147, 1356869, 2010553, 4652239, 17051297, 20831119, 47326519, 122164649, 189695483, 191912659 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS While many values in A214757(n) are equal to A000101(n), here it seems the only value such that A002386(n) is equal to a(n) is a(1) = R_k = A002386(1) = 2. See "Let rho(m) = A179196(m)" comment at A001223. LINKS Dana Jacobsen, Table of n, a(n) for n = 1..59 EXAMPLE A104272(94) = 1301 < 1327 = A002386(10), so a(10) = 1301. PROG (Perl) use ntheory ":all";  sub a_from_2386 { my \$n = shift; \$n = prev_prime(\$n) while !is_ramanujan_prime(\$n); \$n } # Dana Jacobsen, Jul 13 2016 (Perl) perl -Mntheory=:all -nE 'my \$n=\$1 if /(\d+)\$/; \$r=ramanujan_primes(\$n>1e6 ? \$n-1e6 : 2, \$n); say ++\$x, " ", \$r->[-1]; ' b002386.txt # Dana Jacobsen, Jul 13 2016 CROSSREFS Cf. A002386, A104272, A001223. Cf. A214925, A214926, A214757, A214924. Sequence in context: A098919 A161748 A195871 * A079007 A064215 A087238 Adjacent sequences:  A214753 A214754 A214755 * A214757 A214758 A214759 KEYWORD nonn AUTHOR John W. Nicholson, Jul 27 2012 EXTENSIONS Edited by N. J. A. Sloane, Aug 06 2012 a(16)-a(28) from Donovan Johnson, Nov 04 2012 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified December 6 08:53 EST 2019. Contains 329788 sequences. (Running on oeis4.)