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Forum: sweety439 2022-05-28, 14:29
Replies: 36
Views: 2,624
Posted By sweety439
Does such repunit exist?

Is there a repunit Rp with p prime, such that 2*p+1 is prime, and Rp/(2*p+1) is also prime, in base 10? In base 2, there are many such p's: {11, 23, 83, 131, 3359, 130439, 406583, ...}, see A239638...
Forum: sweety439 2022-05-21, 08:46
Replies: 36
Views: 2,624
Posted By sweety439
Can you prove the primality of these PRPs which...

Can you prove the primality of these PRPs which are in order to prove the Riesel...
Forum: sweety439 2022-05-21, 08:14
Replies: 36
Views: 2,624
Posted By sweety439
When will 8*13^32020+183...

When will 8*13^32020+183 (http://factordb.com/index.php?id=1100000000490878060) (the largest minimal prime (https://primes.utm.edu/glossary/xpage/MinimalPrime.html) in base 13, see...
Forum: sweety439 2022-05-07, 08:51
Replies: 36
Views: 2,624
Posted By sweety439
Predict the smallest integer n such that 67607*2^n+1 is prime

Sierpinski conjectured that 78557 is the smallest odd k such that k*2^n+1 is composite for all integer n (for k = 78557, k*2^n+1 must be divisible by at least one of {3, 5, 7, 13, 19, 37, 73}, thus...
Forum: sweety439 2022-03-23, 19:04
Replies: 36
Views: 2,624
Posted By sweety439
Well .... k*b^n+1 for b not power of 2 and...

Well ....

k*b^n+1 for b not power of 2 and b^n > k: Pocklington N-1 primality test (https://primes.utm.edu/prove/prove3_1.html)
k*2^n+1 for k not power of 2 and 2^n > k: Proth primality test...
Forum: sweety439 2022-03-22, 11:33
Replies: 36
Views: 2,624
Posted By sweety439
2^11213-1 can be easily proven prime because its...

2^11213-1 can be easily proven prime because its N+1 can be trivially 100% factored:

Pocklington N-1 primality test (https://primes.utm.edu/prove/prove3_1.html) --> Proth primality test...
Forum: sweety439 2022-03-21, 18:39
Replies: 36
Views: 2,624
Posted By sweety439
R49081 is now proven prime, see post...

R49081 is now proven prime, see post https://mersenneforum.org/showpost.php?p=602219&postcount=35
Forum: sweety439 2022-02-08, 05:17
Replies: 36
Views: 2,624
Posted By sweety439
Other than single-digit primes (2, 3, 5, 7), can...

Other than single-digit primes (2, 3, 5, 7), can a Mersenne exponent be a palindromic prime (https://en.wikipedia.org/wiki/Palindromic_prime)?
Forum: sweety439 2022-02-04, 10:58
Replies: 36
Views: 2,624
Posted By sweety439
How to (use bot to) add many numbers in a...

How to (use bot to) add many numbers in a sequence to factordb? I want to add Bell (https://oeis.org/A000110)(n), Euler (https://oeis.org/A000111)(n), Pell (https://oeis.org/A000129)(n), Tribonacci...
Forum: sweety439 2022-02-01, 06:35
Replies: 36
Views: 2,624
Posted By sweety439
Some sequences like the Motzkin numbers A001006...

Some sequences like the Motzkin numbers A001006 (https://oeis.org/A001006):

* Fubini numbers A000670 (https://oeis.org/A000670): For n<=12000, a(n) is prime only for n = 2, 3, 5, 7, 9, 13, see...
Forum: sweety439 2022-01-16, 17:13
Replies: 36
Views: 2,624
Posted By sweety439
Off-topic

Like Cunningham table (https://homes.cerias.purdue.edu/~ssw/cun/index.html) to various bases, is there any interest to factor the numbers similar to Fibonacci numbers A000045...
Showing results 1 to 11 of 11

 
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