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 A272298 a(n) = n^4 + 324. 3
 324, 325, 340, 405, 580, 949, 1620, 2725, 4420, 6885, 10324, 14965, 21060, 28885, 38740, 50949, 65860, 83845, 105300, 130645, 160324, 194805, 234580, 280165, 332100, 390949, 457300, 531765, 614980, 707605, 810324, 923845, 1048900, 1186245, 1336660, 1500949, 1679940, 1874485, 2085460 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS This is the case k=3 of Sophie Germain's Identity n^4+(2*k^2)^2 = ((n-k)^2+k^2)*((n+k)^2+k^2). LINKS Bruno Berselli, Table of n, a(n) for n = 0..1000 Wikipedia, Sophie Germain's Identity. Index entries for linear recurrences with constant coefficients, signature (5,-10,10,-5,1). FORMULA O.g.f.: (324 - 1295*x + 1955*x^2 - 1285*x^3 + 325*x^4)/(1 - x)^5. [Corrected by Georg Fischer, May 23 2019] E.g.f.: (324 + x + 7*x^2 + 6*x^3 + x^4)*exp(x). a(n) = (n^2 - 18)^2 + (6*n)^2. MATHEMATICA Table[n^4 + 324, {n, 0, 40}] PROG (PARI) vector(40, n, n--; n^4+324) (Sage) [n^4+324 for n in (0..40)] (Maxima) makelist(n^4+324, n, 0, 40); (MAGMA) [n^4+324: n in [0..40]]; (Python) [n**4+324 for n in range(40)] (Python) for n in range(0, 10**5):print(n**4+324, end=", ") # Soumil Mandal, Apr 30 2016 CROSSREFS Cf. A005917. Subsequence of A227855. Cf. A000583 (k=0), A057781 (k=1), A272297 (k=2). Sequence in context: A110709 A298271 A006465 * A088214 A117550 A045287 Adjacent sequences:  A272295 A272296 A272297 * A272299 A272300 A272301 KEYWORD nonn,easy AUTHOR Bruno Berselli, Apr 25 2016 STATUS approved

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Last modified February 19 16:24 EST 2020. Contains 332045 sequences. (Running on oeis4.)