Subject Index by Keyword P - R

Full Titles: A-C D-F G-O P-R S-T U-Z, numbers

Key Word Puzzlet Number Title Palindromic 4 Palindromic Squares 26 Palindromic Odometer Readings 53 Six-Palindromic Odd Numbers 96 Palindromic Waves 107 Even Digit-Count Palindromic Squares 189 Morse Code & Palindromic Primes 190 Count the Days for Palindromic Primes PanDigital 2 Make 100 From A PanDigital 3 PanDigital Fractions 10 PanDigitals Made from Squares 21 An Upside-Down PanDigital! 34 A Pandigital Equation 37 A 10-digit Pandigital from 3rd/4th Powers 42 Pandigital Groups 82 A Pandigitally Logarithmic Equation 123 Square Pandigitals 141 A 10-digit Pandigital from 2nd/3rd PowersA Factorial Prime is a prime which is

' one more or one less than a factorial.

' Example: 23 is a Factorial Prime since

' it's (4! - 1), that is one less than

' the factorial of 4.

' Find all Factorial Primes up to 10^12.157 Pandigitals from Squared Pandigital Parts 193 A Repeating Series from a PanDigital Panel 176 A Control Panel Problem Parts 55 Squares with Consecutive Parts 157 Pandigitals from Squared Pandigital Parts Pattern 185 A Prime with a Digit Pattern Pence 13 Pounds, Shillings, and Pence Pentagonal 188 Figurate Pentagonals Permutation 150 Digit Permutation Sums 158 Primes from Prime Digit Permutations Playing 127 Playing Card Scores Pound 13 Pounds, Shillings, and Pence Power 16 Multiples of Numbers from Powers of their Digits 33 Digits and Powers 37 A 10-digit Pandigital from 3rd/4th Powers 60 Fourth Powers 132 Self-Generating Integer from Digit Powers 135 Numbers formed from Powers of their own Digits 141 A 10-digit Pandigital from 2nd/3rd Powers 197 Sums of Powers in Alternate Number Bases Prefix 129 Un-Prefixable Primes Prime 12 Ordered Primes from Composites 19 Prime Number Intervals 36 Primes and Cubes 48 Manipulating Primes 61 Prime Fibonacci Numbers 77 Making Primes from Primes 90 Primes Both Ways 95 PrimeRuns 120 Squares from Twin Primes 129 Un-Prefixable Primes 131 Primes of Type 4n - 1 133 Primes from Prime Digits 139 Palindromes from Twin Primes 151 Sub-Number Primes 158 Primes from Prime Digit Permutations 161 Squares from Reversed Primes 166 Prime Factor Sum 171 Primes from Prime Digit Rotations 174 A Sequence from Odd, Even & Prime Numbers 179 Shared Prime Factor Sums 182 Squares from Concatenated Prime Factors 185 A Prime with a Digit Pattern 189 Morse Code & Palindromic Primes 190 Count the Days for Palindromic Primes 200 The LSD of Prime Numbers 204 Prime Runs including Zero 205 Consecutive Integers with same Prime Factor Sum 216 Consecutive Primes With Target Intervals 217 Prime Factor Sequence 219 Composite to Prime Ratios 221 Prime Factors 225 Prime Factorials Primitive 183 Integer Products by Digit Rotation Problem 176 A Control Panel Problem Process 66 The Kaprekar Process Product 23 Integer Products by Digit Rotation 31 Products and Reversed Sums 39 Equal Products and Sums 41 Digital Products 65 Repeated Digit Product 73 Anagrammatic Products & 31 78 UniDigits from Products 84 Anagrammatic Products 113 Self-Generated Integer Products 122 A Run from a Product 126 Matrix Products 144 A Reversed Product 159 Triangular Numbers from Triplet Products 170 Integer Products Again 195 Hexadecimal Product Anagrams 199 A Sequence from Digit Sums & Products 210 Triplets with the same Final Digit Product Progression 89 Arithmetic Progressions and Palindromes Proper 114 Proper Divisor Strings Prosum 224 Prosum Numbers Quadratic 71 A Quadratic Discriminator Ratio 219 Composite to Prime Ratios Reading 26 Palindromic Odometer Readings Rectangle 70 A Rectangle and a Square Related 102 Related Ages Repeated 110 Repeated Digit Sums and 15 Return 67 A Return Car Journey Reversal,

Reverse,

Reversed,

l31 Products and Reversed Sums 57 Integer Reversals 58 Reversals and Anagrams 101 Numerical Reversals 134 A Square from an Integer and its Reverse 137 A Reverse Run from Squares 144 A Reversed Product 147 Denary Integer Reversal in A Lower Base 154 3-Digit Integer Reversal for any Base Change 161 Squares from Reversed Primes 173 Age Reversals 180 Generating Reverse Runs Right 28 Right-Angled Triangles 43 More Right-Angled Triangles 64 Another Right-Angled Triangle 183 A Primitive Right-Angled Triangle Root 162 Squares with Embedded Roots Rotated 153 Squares from Rotated Squares Run 74 A run from two squares 95 PrimeRuns 122 A Run from a Product 137 A Reverse Run from Squares 140 A Square from two Runs 180 Generating Reverse Runs 186 A Run of Consecutive Composites 204 Prime Runs including Zero

Full Titles: A-C D-F G-O P-R S-T U-Z, numbers

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