< Events that happened in #onthisday #otd #history #twitterstorians #dh
Historical events when someone or something
discovered
.
Sorted by importance.

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that every positive integer is representable as a sum of at most three triangular numbers

750827
2
2
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750827

the construction of the heptadecagon

750824
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in 1796
regular polygon can be constructed by compass and straightedge if and only if the number of sides is the product of distinct Fermat primes and a power of 2

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4
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750823

737819
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736906
5
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3
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721884

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716273

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5
2
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713853

713824
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2
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2
713824

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713722

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713438

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713304

400236
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400236

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3
100
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264775

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5
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264773