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 A053001 Largest prime < n^2. 23
 3, 7, 13, 23, 31, 47, 61, 79, 97, 113, 139, 167, 193, 223, 251, 283, 317, 359, 397, 439, 479, 523, 571, 619, 673, 727, 773, 839, 887, 953, 1021, 1087, 1153, 1223, 1291, 1367, 1439, 1511, 1597, 1669, 1759, 1847, 1933, 2017, 2113, 2207, 2297, 2399, 2477, 2593 (list; graph; refs; listen; history; text; internal format)
 OFFSET 2,1 COMMENTS Suggested by Legendre's conjecture (still open) that there is always a prime between n^2 and (n+1)^2. Legendre's conjecture is equivalent to a(n) > (n-1)^2. - John W. Nicholson, Dec 11 2013 REFERENCES J. R. Goldman, The Queen of Mathematics, 1998, p. 82. LINKS T. D. Noe, Table of n, a(n) for n=2..1000 FORMULA a(n) = A007917(A000290(n)). - Reinhard Zumkeller, Jun 07 2015 MAPLE [seq(prevprime(i^2), i=2..100)]; MATHEMATICA Table[Prime[PrimePi[n^2]], {n, 2, 60}] (* Stefan Steinerberger, Apr 01 2006 *) Table[NextPrime[n^2, -1], {n, 2, 60}] (* Jean-François Alcover, Oct 14 2013 *) PROG (PARI) a(n) = precprime(n^2) \\ Michel Marcus, Oct 14 2013 (Haskell) a053001 = a007917 . a000290  -- Reinhard Zumkeller, Jun 07 2015 CROSSREFS Cf. A007491, A053000, A014085. Cf. A007917, A000290. Sequence in context: A091652 A291546 A134197 * A053607 A209407 A124129 Adjacent sequences:  A052998 A052999 A053000 * A053002 A053003 A053004 KEYWORD nonn,easy,nice AUTHOR N. J. A. Sloane, Feb 21 2000 EXTENSIONS More terms from James A. Sellers, Feb 22 2000 STATUS approved

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Last modified November 21 00:36 EST 2018. Contains 317427 sequences. (Running on oeis4.)