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Search: id:A055071
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| A055071 |
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Largest square dividing n!. |
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+0
10
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| 1, 1, 1, 4, 4, 144, 144, 576, 5184, 518400, 518400, 2073600, 2073600, 101606400, 914457600, 14631321600, 14631321600, 526727577600, 526727577600, 52672757760000, 52672757760000, 6373403688960000, 6373403688960000
(list; graph; listen)
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OFFSET
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1,4
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COMMENT
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By definition 3 of A000188, this is [A000188(n!)]^2.
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FORMULA
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a(n)=Max{d; d divides n! and it is a square number}=A008833(n!)
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MAPLE
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for n from 1 to 40 do it := ifactors(n!): sq := 1: for i from 1 to nops(it[2]) do if it[2][i][2] mod 2 = 0 then sq := sq*it[2][i][1]^it[2][i][2] else sq := sq*it[2][i][1]^(it[2][i][2]-1) fi; od: printf(`%d, `, sq) od:
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CROSSREFS
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Cf. A000188, A008833.
Sequence in context: A009534 A009559 A163196 this_sequence A097572 A160365 A080509
Adjacent sequences: A055068 A055069 A055070 this_sequence A055072 A055073 A055074
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Jun 13 2000
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EXTENSIONS
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More terms from James A. Sellers (sellersj(AT)math.psu.edu), Jun 20 2000
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