1399*2^1762191-1 (530476 digits)

1347*2^1765384-1 (531437 digits)
1005*2^1765454-1 (531458 digits)

4069*2^1781691-1 (536347 digits)

An another million digits prime for k=113:

113*2^3628034-1 (1092150 digits) :smile:

1005*2^1775235-1 (534402 digits)

k=37
 

37·2[SUP]6660841[/SUP]-1 ([URL="http://primes.utm.edu/primes/page.php?id=118270"]2,005,115 digits[/URL])

(Note: This was in context of the Riesel-like-base1024 conjecture, so only n ≡ 1 (mod 10) were tested up to n=6700000.)

Congrats on your bi-mega :toot:

It is amazing that such a prime was verified in 3.61 hours by CC @ UTM.

Congratulations! :groupwave:

Serge's find is valued at 8% of RPS' entire production currently on top 5000.
Congratulations!

Ah, heck. It was only luck.

But: "The more I practice, the luckier I get". (Which might be one of those things that [I]Yogi Berra also never said[/I]. The authorship is disputed, as is the case with any [I]bon mot[/I] including "Prediction is very difficult, especially about the future")

[QUOTE=Batalov;379365]37·2[SUP]6660841[/SUP]-1 ([URL="http://primes.utm.edu/primes/page.php?id=118270"]2,005,115 digits[/URL])

(Note: This was in context of the Riesel-like-base1024 conjecture, so only n ≡ 1 (mod 10) were tested up to n=6700000.)[/QUOTE]

Great prime discovery Batalov :smile:

Here's another smallish one:
1333*2^1784103-1 (537072 digits)