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Geeky Maths Things: 148 – Heptagonal Numbers

Day 148 of my 365 project reminds me about heptagonal numbers. 148 is a good example of a heptagonal number because it fits two of the three heptagonal number categories: heptagonal numbers, centred heptagonal numbers and centred heptagonal primes. As you can see, these numbers make heptagons. The first few heptagonal numbers are 1, 7, 18, 34, 55, 81, 112, 148… and […]

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