These positive integers equal the sum of their positive divisors excluding themselves; 6 and 28 are examples.

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Perfect Numbers — value or symbol: 6, 28, 496... Source: Perfect number ↗

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07Each interior entry in this triangular array is the sum of the two entries directly above it.RECALL
Pascal's Triangle
Pascal's triangle builds each entry from the sum of the two numbers above it in the row before.
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08These numbers read identically forwards and backwards, such as 121 and 1331.RECALL
Palindromic Numbers
Palindromic numbers read identically forwards and backwards, a favorite subject of recreational number theory.
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09This mathematical concept represents the unbounded and endless, and is not treated as an ordinary number in arithmetic.RECALL
Infinity
Infinity represents the unbounded and endless, and is not treated as an ordinary number in arithmetic.
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