The Dow had 5 consecutive point drops starting on July 30:

July 30 → 23.33

July 31 → 333.75

Aug 1 → 280.85

Aug 2 → 98.41

Aug 5 → 767.27

The largest (767 points) occurred on August 5.

• August 5th is 694 days after 9/10/'17.
• August 5th is 767 days before 9/10/'21.

Joining 17 and 21 forms 1721, the 268th prime number.

The 767 point drop occurred on the 217th day of the year.  217 is formed by merging 21 and 17.

1721 - 217 = 1504

The total point loss during the five-day (July 30 to August 5) losing streak was 1504 points:

23.33 + 333.75 + 280.85 + 98.41 + 767.27 ≈ 1504

• 9/10 is the 253rd day of the year.
• 3541 is the 496th prime number.
• 14:53 military time is 2:53 on the twelve hour clock.
• 1453 is the number to which 268 must be added to reach 1721.

1453 + 268 = 1721

Consider also:

• The divisors of 1504 sum to 3024.

• 3024 = (11×11×11) + 1693
• (16×93) = 1488
• 496 is the (3)rd perfect number and a divisor of 1488 → 496×(3) = 1488

Joining 21 and 17 forms 2117.

2117 − (1488) = 629

2117 − (496) = 1621

• 1621 is the 257th prime number.
• 257 is the 55th prime number.
• 55 is the 10th Fibonacci number.
• The difference between 629 and the sum (684) of it's divisors is 55.
• Adding 10 to 684 equals 694, the reflection of 496 (the third perfect number).

Consider the first four of the five consecutive point drops:

• 7/30 → 23
• 7/31 → 334
• 8/1 → 281
• 8/2 → 98

(7 + 30) + (7 + 31) = 75

281 + 98 = 379

379 is the 75th prime number.

• The total point loss during the five-day losing streak was 1504 points.
• 15:04 military time is 3:04 on the twelve hour clock.
• Adding 75 to 304 is equal to 379, the 75th prime number.

The first two (23.33 on 7/30 and 333.75 on 7/31) consecutive point drops sum to 357.

17 and 21 are divisors of 357: (17×21) = 357

(3×57) = 171

1019 is the 171st prime number.

The largest percentage decline in the Dow's history occurred on October 19 (10/19), 1987.

10/19/1987 = [10 + 19 + (19 + 87)] + [(1 + 0) + (1 + 9) + (1 + 9 + 8 +7)] = 171

• From 10/19/'17 to July 30, 2019 is 649 days.
• July 31, 2019 is 811 days before 10/19/'21.

• 730 + 731 = 1461

A four year duration is equivalent to 1461 days:

• 21:10 military time is 9:10 on the twelve hour clock.
• (2110) - 649 = 1461 = 730 + 731
• 811 + (910) = 1721