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The first Pentagonal Number is 1. The second is 5. Each subsequent pentagonal number is 2 times the previous pentagonal number + 3 - the pentagonal number that is 2 positions earlier in the sequence. The first 10 pentagonal numbers are 1, 5, 12, 22, 35, 51, 70, 92, 117, and 145. pentagonalNumber(0) → 1 pentagonalNumber(1) → 5 pentagonalNumber(2) → 12 ...Save, Compile, Run (ctrl-enter) |
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