[QUOTE=Madpoo;422957]That reminds me that I ran across the story of the Cray finding M32 ( M(756839) ) in "only" 19 hours on a Cray 2, and a mere 3 hours on a Cray C90 with 16 CPUs.
[URL="https://primes.utm.edu/notes/756839.html"]https://primes.utm.edu/notes/756839.html[/URL]

So I was curious... how fast was it on a modern CPU. Well, I finished in 3 minutes give or take a few seconds.[/QUOTE]9 minutes on 1 core of my 7 year old laptop running Prime 95 v27.7 32-bit.

When I first joined GIMPS, assignments were taking ~1 month on a Pentium.

[QUOTE=ewmayer;422945]Echoing Wayne's reply to your post - 2nd digit of the exponent or of the number's decimal expansion?[/QUOTE]

The former.

Edit: Fun fact: the digit run 314159 occurs twenty two times in the decimal expansion, yet 3141592 doesn't occur. 2718281 occurs twice.

70E6+expilon
 

[QUOTE=firejuggler;422944]so we know it is in the 74M[/QUOTE]

Maaaaan! I was convinced that there was a hidden gem in range [7e7; 8e7), so I did test a number of exponents in the low 7xM range about 1 year ago, but (as usual) I lost patience and switched to factoring :).

[QUOTE=E_tron;422961]I eagerly await the news. Congrats to the Mersenne Community; a genuine discovery.[/QUOTE]

The question is, will we be congratulating a person, or a shadowy anonymous figure?

It is a person bro, George [URL="http://www.mersenneforum.org/showpost.php?p=422393&postcount=219"]said so[/URL], few posts above.

[QUOTE=LaurV;422980]It is a person bro, George [URL="http://www.mersenneforum.org/showpost.php?p=422393&postcount=219"]said so[/URL], few posts above.[/QUOTE]

Ack! How did I miss that?

[QUOTE=Dubslow;422972]TEdit: Fun fact: the digit run 314159 occurs twenty two times in the decimal expansion, yet 3141592 doesn't occur. 2718281 occurs twice.[/QUOTE]Now I know the exponent.

[QUOTE=retina;422982]Now I know the exponent.[/QUOTE]

Really now? :smile:

[QUOTE=Dubslow;422983]Really now? :smile:[/QUOTE]You spilled the beans. It is a simple query to match.

[QUOTE=Prime95;422942]While you are waiting, as a reward to GIMPS' most dedicated users, a hint:

The second digit is a 4[/QUOTE]

A similar hint: bcp19 is closest

You people have no patience. Now you see why the exponent has to be hidden :razz: