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A297843 a(n) = Sum_{d|n} max(d, n/d)^4. 4
1, 32, 162, 528, 1250, 2754, 4802, 8704, 13203, 21250, 29282, 44576, 57122, 81634, 102500, 139520, 167042, 225666, 260642, 341250, 393764, 497794, 559682, 715808, 781875, 971074, 1076004, 1310946, 1414562, 1743842, 1847042, 2236416, 2401124, 2839714, 3006052 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
FORMULA
a(n) + A297794(n) = 2*A001159(n).
MATHEMATICA
f[n_] := Block[{d = Divisors@ n}, Plus @@ (Max[#, n/#]^4 & /@ d)]; Array[f, 35] (* Robert G. Wilson v, Jan 07 2018 *)
PROG
(PARI) {a(n) = sumdiv(n, d, max(d, n/d)^4)}
CROSSREFS
Sum_{d|n} max(d, n/d)^k: A117003 (k=1), A297841 (k=2), A297842 (k=3), this sequence (k=4), A297844 (k=5).
Sequence in context: A299680 A300312 A197367 * A172191 A304381 A281467
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Jan 07 2018
STATUS
approved

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Last modified March 28 07:33 EDT 2024. Contains 371235 sequences. (Running on oeis4.)