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176 INDEX

Palindromic numbers, go, 91
Pascal’s triangle, 161
Percentages, 143

Perfect numbers, 87-9, 158
Pi, 112-22, 124

Positive numbers, 12, 14, 15
‘Power’ numbers, 30—4
Primes, 46-63, 111
Probability, 31

Pythagorean numbers, 22—4, 83

Rational numbers, 15
Residues, 108
Russell, A. H., 67

Sarrus, 55
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Scales of Notation, 11, 159

Series, 17-37, 81, 89, 102, 139,
146, 172

Series, consecutive odd num-
bers, 21, 24, 25, 27-30, 48,
55-63

Squares, 17-27, 29-35, 37, 43

Statistics, 142

Tartaglia, 172
Triangular numbers, 17-21, 28,

44, 9, 165
Trigonometrical ratios, 81-6

Weights problems, 172
Wilson’s theorem, 111

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