| A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 |
| H | A | L | = | 8 | 01 | 12 | = | 80112 |
| F | L | I | = | 6 | 12 | 09 | = | 61209 |
| F | E | T | = | 6 | 05 | 20 | = | 60520 |
| H | R | E | = | 8 | 18 | 05 | = | 81805 |
| E | - | - | = | 5 | 00 | 00 | = | 50000 |
•
The sum of last column is 333646,
whose reverse is 646333.
•
Subtracting 333646 from 646333 we get 312687,
• whose product of digits is
3
×
1
×
2 ×
6 ×
8 ×
7
=
2016.
• Finally, adding 2016 to the sum of its digits we get
• 2016 + 2+0+1+6 = 2025.
| H | A | L | = | 8 | + | 1 | + | 12 | = | 21 |
| F | L | I | = | 6 | + | 12 | + | 9 | = | 27 |
| F | E | 3 | = | 6 | + | 5 | + | 3 | = | 14 |
• The sum of last
column is 21 +
27 +
14
= 62, and
• adding 62 to the product of its digits we get
•
62 + (6 × 2) = 74 and
• the 74-th triangular number is 2775.
• Finally,
27
×
75
=
2025.