Reserving Cullen bases 52, 54, 56, 57, 58, 59 to n = 200000.

All of my updates (and only my updates), including this one, have been applied to the wiki.

b239+ taken to 100k, no prime, base released.
taking b241+.

Cullen b241 taken to 100e3, taking Cullen b251

[QUOTE=ryanp;630632]Primes found so far:

[CODE]127441*60^127441+1
231158*60^231158+1
326342*60^326342+1[/CODE][/QUOTE]

I've completed Cullen base 60 to n=1.5M. The only primes found were those three.

I'm going to reserve Cullen bases b=16 through b=20 (inclusive) to n=1M each.

[QUOTE=ryanp;630883]I'm going to reserve Cullen bases b=16 through b=20 (inclusive) to n=1M each.[/QUOTE]

Would you mind adding b=14? That is the only one that is not reserved and not searched to n=1e6.

[QUOTE=rogue;630886]Would you mind adding b=14? That is the only one that is not reserved and not searched to n=1e6.[/QUOTE]

Sure. Reserving b=14 through n=1M as well.

[QUOTE=ryanp;630889]Sure. Reserving b=14 through n=1M as well.[/QUOTE]

Thanks. Of course I wouldn't be surprised if you find your next mega-digit Cullen prime with base 14. :smile:

Out of curiosity are you using gcwsieve, gcwsievecl, or something else? How deeply are you sieving?

I am nearly done searching b=14,16,17,18,19,20 to n=1M. Primes found so far:

[CODE]219525*18^219525+1
342091*18^342091+1
353901*18^353901+1
329994*20^329994+1
364595*20^364595+1
612497*18^612497+1
811138*17^811138+1
793181*20^793181+1[/CODE]

The last three are >= 700K decimal digits and are processing on T5K now.

One more: [URL="https://t5k.org/primes/page.php?id=136072"]993149*20^993149+1[/URL].

b251+ done to 100e3, no prime
taking b253+