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A016924
a(n) = (6*n + 1)^4.
9
1, 2401, 28561, 130321, 390625, 923521, 1874161, 3418801, 5764801, 9150625, 13845841, 20151121, 28398241, 38950081, 52200625, 68574961, 88529281, 112550881, 141158161, 174900625, 214358881, 260144641, 312900721, 373301041, 442050625, 519885601, 607573201, 705911761
OFFSET
0,2
FORMULA
From Amiram Eldar, Mar 28 2022: (Start)
a(n) = A016921(n)^4 = A016922(n)^2.
Sum_{n>=0} 1/a(n) = PolyGamma(3, 1/6)/7776. (End)
MATHEMATICA
(6Range[0, 30]+1)^4 (* Harvey P. Dale, May 18 2011 *)
PROG
(Magma) [(6*n+1)^4: n in [0..50]]; // Vincenzo Librandi, May 04 2011
CROSSREFS
KEYWORD
nonn,easy
STATUS
approved