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A076581 Triangular numbers which are 7-almost primes. 0

%I

%S 2080,4560,8128,9180,10296,10440,12720,12880,15400,18336,18528,21528,

%T 23220,23436,29403,29646,37128,39060,43956,52326,56280,61425,64980,

%U 67896,70500,81810,82215,86320,86736,93096,93528,100576,103740,105570

%N Triangular numbers which are 7-almost primes.

%e a(1)=2080, 2080 is a triangular number and 2080=2*2*2*2*2*5*13 i.e. is a product of 7 prime factors so is 7-almost prime.

%K base,easy,nonn

%O 1,1

%A _Shyam Sunder Gupta_, Oct 19 2002

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Last modified June 28 08:51 EDT 2022. Contains 354903 sequences. (Running on oeis4.)