91st Black Tuesday Anniversary: October 19 to 30th →(17, 71), (17 + 59 + 277) = 353

• The net change in the trading week beginning on October 19 (10/19) was (- 271) points.
• 271 is the 58th prime number.
• On October 19 (10/19) the Dow lost 411 points (the largest daily change during the week).
• 1019 is the 171st prime number.

• 171 is formed by merging 17 and 71.
• The 17th prime number is 59.
• The 59th prime number is 277.

• The prime-chain is (17, 59, 277).
• (17 + 59 + 277) = 353 (the 71st prime number).

• During the following trading week (October 26 to 30) the net change was (- 1834) points.
• 1693 is the 264th prime number.
• 17 is the 7th prime number.

264 + (7) = 271 (the 58th prime)

58 + (7 + 17 + 59) + 1693 = 1834

58 + (353) = 411

Consider the daily changes (rounded to nearest whole number) in the trading week beginning on October 26:

• October 26 → - 650
• October 27 → - 222
• October 28 → - 943
• October 29 →   139
• October 30 → - 158

The only daily change (139) which is a prime number occured on the date (10/29) during the week where the month number (10) and day number (29) form a number-prime relationship.

• 139 is the 34th prime number.
• The 139th prime number is 797.

(34 + 139 + 797) + 17 = 987

• 17 is the 7th prime number.
• The prime chain starting at 7 is: (7, 17, 59, 277).

(34 + 139 + 797) - (7 + 17 + 59 + 277) = 610

• 610 is the 15th Fibonacci number.
• 987 is the 16th Fibonacci number.

• The trading week starting on October 19 ended 264 days after Super Bowl 54.
• 71 - 17 = 54
• The 54th prime is 251.
• The 251st prime is the 17th (1597) Fibonacci number.
• 1346 is the number to which 251 must be added to reach 1597.

(17×71) + 139 = 1346

• October 29, 2020 is the 91st anniversary of Black Tuesday.
• 91 is the 13th triangular number.
• 7 and 13 are the prime factors of 91.
• The 7th prime number is 17.
• The 13th prime number is 41.
• (17 + 41) = 58
• The 58th prime number is  271.
• (1741) is the 271st prime number.

• The 41st prime number is 179.
• The prime chain is (13, 41, 179).
• (13 + 41 + 179) = 233, the 13th Fibonacci number.
• (1471), the reflection of (1741) is the 233rd prime number.

• Separating the first two (14 and 17) and last two (71 and 41) digits of each number provides the pairing (17, 71) and (14, 41).
• Merging 17 and 71 forms 171.
• Merging 14 and 41 forms 141.

1693 + (141) = 1834

•  The 17th Fibonacci number is 1597.
• 1597 is the 251st prime number.
• 1346 is the number to which 251 must be added to reach 1597.

• 17 is the 7th prime number.
• The 17th prime number is 59.
• 11 is the 5th prime number; 23 is the 9th prime number.
• Joining 7 and 59 forms 759.
• 253 is a divisor of 759.
• The prime factors of 253 are 11 and 23.

• The 59th prime number is 277.
• (17 + 59 + 277) = 353, the 71st prime number.
• Joining 17 and 71 forms 1771.
• 7 and 253 are divisors of 1771.
• 7, 11 and 23 are the prime factors of 1771.

1346 + 759 = 271 + 1834