Happiest Returns 61!

Happy Birthday J9!

Fitting for Gemini this numbered year would represent a 'twin prime', of the 18 prime numbered ones you've celebrated so far.

 So, Happy 18th prime!

But, there's more!!! The number coinciding with the year of the Bay of Pigs invasion is too a 'Cuban Prime:

p = x³ − y³/x − y, where x = y + 1.

 

Fidel says, feliz cumpleaños

 

 

More incredibly...(as if it could be!)

The NGC 61 is a pair of lenticular galaxies, NGC 61-A (or NGC 61-1) and NGC 61-B (or NGC 61-2) in the constellation Cetus. (In case you were wanting to 'get away from it all').

 

Happy Birthday 61!

Fitting for Gemini this numbered year would represent a 'twin prime', of the 18 prime numbered ones you've celebrated so far.

(Oh yeah, did that twice!)

So, Happy 18th prime! Happy 18th prime!

Elementary Watson, observe 61 is also the number of the chemical element, Promethium which: "...is a chemical element with the symbol Pm and atomic number 61. All of its isotopes are radioactive; it is extremely rare, with only about 500–600 grams naturally occurring in Earth's crust at any given time. Promethium is one of only two radioactive elements that are followed in the periodic table by elements with stable forms".

Not to be confused with Prometheus, 

(of whom it shall never be spake...)

But most importantly, 61 is one of the "Fortunate Numbers, to whit: In the list of Fortunate numbers, 61 occurs thrice, since adding 61 to either the tenth, twelfth or seventeenth primorial gives a prime number^[9] (namely 6,469,693,291; 7,420,738,134,871; and 1,922,760,350,154,212,639,131)".

So, there you go...

Have a most fortunate 61st, and if it may not recur thrice for you, then consider yourself doubly fortunate!

Happy Birthday,

J9