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 A138420 a(n) = ((prime(n))^4-(prime(n))^2)/4. 5
 3, 18, 150, 588, 3630, 7098, 20808, 32490, 69828, 176610, 230640, 468198, 706020, 854238, 1219368, 1971918, 3028470, 3460530, 5036658, 6351660, 7098228, 9735960, 11862858, 15683580, 22129968, 26012550, 28135068, 32767038, 35286570 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Number of monic irreducible polynomials of degree 4 over GF(prime(n)). - Robert Israel, Jan 07 2015 LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..200 FORMULA a(n) = A138402(n)/4. - R. J. Mathar, Oct 15 2017 MAPLE seq(1/4*(ithprime(i)^4 - ithprime(i)^2), i=1..100); # Robert Israel, Jan 07 2015 MATHEMATICA a = {}; Do[p = Prime[n]; AppendTo[a, (p^4 - p^2)/4], {n, 1, 50}]; a PROG (MAGMA) [(NthPrime((n))^4 - NthPrime((n))^2)/4: n in [1..30] ]; // Vincenzo Librandi, Jun 17 2011 (PARI) forprime(p=2, 1e3, print1((p^4-p^2)/4", ")) \\ Charles R Greathouse IV, Jul 15 2011 CROSSREFS Cf. A008837, A127919, A138420, A138426. Sequence in context: A118331 A240921 A221961 * A152409 A200320 A347020 Adjacent sequences:  A138417 A138418 A138419 * A138421 A138422 A138423 KEYWORD nonn,easy AUTHOR Artur Jasinski, Mar 19 2008 EXTENSIONS Name edited by Robert Israel, Jan 07 2015 STATUS approved

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Last modified January 27 03:09 EST 2022. Contains 350601 sequences. (Running on oeis4.)