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A152453
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Where records in occur in A152235.
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1
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1, 2, 4, 12, 48, 144, 576, 720, 2880, 25920, 129600, 414720, 907200, 14515200, 58060800, 130636800, 522547200, 3265920000, 13063680000, 22861440000
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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EXAMPLE
| First few terms of A152235 are 1, 2, 2, 3, 2, 2, 2, 2, 3, 2, 2, 6, so a(1) to a(4) are 1, 2, 4, 12.
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PROG
| (MAGMA) W:=[]; r:=0; for n in [1..1300000] do a:=&*PrimeDivisors(NumberOfDivisors(n)); if r lt a then r:=a; Append(~W, n); end if; end for; print W;
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CROSSREFS
| Cf. A152235 (largest squarefree number dividing the number of divisors of n), A152452 (records in A152235), A007947 (largest squarefree number dividing n).
Sequence in context: A165901 A074449 A131387 * A172452 A004527 A002871
Adjacent sequences: A152450 A152451 A152452 * A152454 A152455 A152456
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KEYWORD
| more,nonn
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AUTHOR
| Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Dec 04 2008
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EXTENSIONS
| a(15)-a(20) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Jul 30 2011
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