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Pentagonal triple triangles (Posted on 2016-07-01) Difficulty: 3 of 5
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
Some ThoughtsSecond part.broll2016-07-01 10:54:34
re: computer method (the part that wouldn't fit)Charlie2016-07-01 10:14:21
Some Thoughtscomputer methodCharlie2016-07-01 10:13:19
Some ThoughtsObservations on first part.broll2016-07-01 09:49:50
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