This nBAB was created on Thanksgiving Day 2008. There is debate about what year the first Thanksgiving took place: 1565 or 1621? MathBabbler avoided the contention by creating this nBAB for 1621 and another nBAB for 1565.

MathBabbler Number Analyst (MBNA) output: ========================================= 1621 is a natural, whole, integer 1621 is odd 1621 is unhappy 1621 is not a Harshad number 1621 is prime ...Sexy prime with 1627 ...Twin prime with 1619 ...Pythagorean ...Super 1621 in octal is 03125 1621 in hexadecimal is 0x655 1621 in binary is 11001010101 (is evil) 1621 nearest square numbers: -21...60 (1600 [40]...1681 [41]) sqrt(1621) = 40.2616 ln(1621) = 7.3908 log(1621) = 3.20978 1621 reciprocal is .00061690314620604565083281924737 1621! is 1.17738e+4501 1621 is 515.98 Pi years 1621 is 81 score and 1 year

`written as Roman numeral is`

1621`.`

MDCXXI

**Creator:** Gerald Thurman
[gthurman@gmail.com]

**Created:** 27 November 2008 (nBAB# 78)

This work is licensed under a Creative Commons Attribution 3.0 United States License.