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

%I #5 Dec 15 2022 13:56:36

%S 7,17,84,115,220,468,3058,5719,18290,182104,144738,1984619,12051935

%N a(n) is the index of the smallest n-gonal pyramidal 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/PyramidalNumber.html">Pyramidal Number</a>

%Y Cf. A358864, A359016.

%K nonn,more

%O 3,1

%A _Ilya Gutkovskiy_, Dec 12 2022