perplexus.info :: Geometry : Pentagonal triple triangles

Pentagonal triple triangles (Posted on 2016-07-01)

Which triangular numbers are three times a pentagonal number?

Is there a geometrical interpretation to this?

No Solution Yet Submitted by Jer

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Subject	Author	Date
Second part.	broll	2016-07-01 10:54:34
re: computer method (the part that wouldn't fit)	Charlie	2016-07-01 10:14:21
computer method	Charlie	2016-07-01 10:13:19
Observations on first part.	broll	2016-07-01 09:49:50

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