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A357590

Triangular numbers which are products of five distinct primes.

3570, 8778, 9870, 12090, 13530, 20706, 20910, 21945, 24090, 24310, 26565, 33670, 40470, 40755, 47586, 54285, 57630, 57970, 63546, 66430, 69006, 72390, 76245, 87990, 88410, 91806, 92235, 94395, 94830, 98790, 121278, 130305, 132870, 133386, 141778, 148785, 154290, 159330, 163878, 167910

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OFFSET

1,1

COMMENTS

A squarefree subsequence of triangular numbers (T(n) = n*(n+1)/2).

LINKS

Table of n, a(n) for n=1..40.

EXAMPLE

3570 = 2*3*5*7*17 = 84*85/2.

21945 = 3*5*7*11*19 = 209*210/2.

121278 = 2*3*17*29*41 = 492*493/2.

154290 = 2*3*5*37*139 = 555*556/2.