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A358321 a(n) is the index of the smallest n-gonal number with exactly n distinct prime factors. 1

%I #66 Dec 15 2022 13:56:12

%S 11,210,87,228,1155,7854,66612,395646,2193303,8389010,122574155,

%T 630341910,6066475415

%N a(n) is the index of the smallest n-gonal number with exactly n distinct prime factors.

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/DistinctPrimeFactors.html">Distinct Prime Factors</a>

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/PolygonalNumber.html">Polygonal Number</a>

%Y Cf. A358862, A359014.

%K nonn,more

%O 3,1

%A _Ilya Gutkovskiy_, Dec 12 2022

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Last modified July 17 05:50 EDT 2024. Contains 374360 sequences. (Running on oeis4.)