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A017332 a(n) = (10*n + 5)^4. 1
625, 50625, 390625, 1500625, 4100625, 9150625, 17850625, 31640625, 52200625, 81450625, 121550625, 174900625, 244140625, 332150625, 442050625, 577200625, 741200625, 937890625, 1171350625, 1445900625, 1766100625, 2136750625, 2562890625, 3049800625, 3603000625 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,1
LINKS
FORMULA
G.f.: -625*(x^4 + 76*x^3 + 230*x^2 + 76*x+1)/(x-1)^5. - Colin Barker, Nov 14 2012
From Amiram Eldar, Apr 18 2023: (Start)
a(n) = A017329(n)^4.
a(n) = 5^4 * A016756(n).
Sum_{n>=0} 1/a(n) = Pi^4/60000. (End)
MATHEMATICA
Table[(10*n + 5)^4, {n, 0, 30}] (* Amiram Eldar, Apr 18 2023 *)
PROG
(Magma) [(10*n+5)^4: n in [0..35]]; // Vincenzo Librandi, Aug 02 2011
CROSSREFS
Sequence in context: A180259 A017224 A106321 * A167039 A265932 A017452
KEYWORD
nonn,easy
AUTHOR
STATUS
approved

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Last modified March 19 01:22 EDT 2024. Contains 370952 sequences. (Running on oeis4.)