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A072072 Least number initiating a chain of n consecutive numbers each of which has maximal prime exponent exactly 3. 0

%I #10 Oct 19 2017 10:38:25

%S 8,135,6858,2068373,133799496,80566783622,30199064929748

%N Least number initiating a chain of n consecutive numbers each of which has maximal prime exponent exactly 3.

%C a(7) <= 30199064929748 ("=" if there are no bugs in my program), a(8) > 300000000000000 (unless there's a bug in my program). - Brad Chalfan (bradc(AT)hevanet.com), Nov 13 2002

%e m = 2068373 = 17*17*17*421,

%e m+1 = 2068374 = 2*3*7*11*11*11,

%e m+2 = 2068375 = 5*5*5*37*16547,

%e m+3 = 2068376 = 2*2*2*47*5501.

%Y Cf. A071318-A071320, A071125.

%K more,nonn

%O 1,1

%A _Labos Elemer_, Jun 13 2002

%E One more term from _Don Reble_, Jun 17 2002

%E a(6) <= 80566783622 from _Don Reble_, equality established by Brad Chalfan (bradc(AT)hevanet.com), Nov 13 2002

%E 30199064929748 confirmed to be the 7th term by _Donovan Johnson_, Jun 15 2009

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Last modified April 25 16:38 EDT 2024. Contains 371989 sequences. (Running on oeis4.)