List questions from semiprimes

Published on 08 Aug 2015 - 20:08

69

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Can two different sets of semiprimes share the same sum?

Published on 09 Sep 2015 - 7:44

1.4k

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What is an upper bound for number of semiprimes less than $n$?

Published on 20 Jan 2016 - 16:22

151

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Is always two times an even semiprime at a distance $1$ or prime to the closest previous odd semiprime?

Published on 10 Feb 2016 - 23:57

191

Views

Has the Pascal-like triangle of semiprimes a hidden primality test or there is a counterexample?

Published on 24 Feb 2016 - 8:06

116

Views

Concatenating the first n semiprimes (in order) to get a semiprime $469101415$...

Published on 21 Apr 2016 - 10:59

168

Views

Factoring semiprimes cost estimation

Published on 27 Apr 2016 - 16:05

589

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Density of semiprimes on short intervals

Published on 15 Apr 2013 - 16:33

8.5k

Views

Check if a Number is Semiprime

Published on 01 Jul 2013 - 16:49

615

Views

All Sufficiently Large Squares, Represented as Sum of Two Semiprimes

Published on 03 Sep 2013 - 2:33

539

Views

relative size of most factors of semiprimes, close?

Published on 29 Nov 2013 - 19:13

242

Views

Semiprimes with three (and more) numbers

Published on 11 Jul 2017 - 20:07

83

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between two semiprimes differing by 4 there are two primes

Published on 11 Oct 2017 - 18:02

138

Views

primes and semiprimes found with $n=11,13,17,19 \mod 30$.

Published on 19 Oct 2017 - 17:33

140

Views

Mersenne semiprimes

Published on 27 Dec 2017 - 22:10

List Question

Mersenne semiprimes with square indices

Can two different sets of semiprimes share the same sum?

What is an upper bound for number of semiprimes less than $n$?

Is always two times an even semiprime at a distance $1$ or prime to the closest previous odd semiprime?

Has the Pascal-like triangle of semiprimes a hidden primality test or there is a counterexample?

Concatenating the first n semiprimes (in order) to get a semiprime $469101415$...

Factoring semiprimes cost estimation

Density of semiprimes on short intervals

Check if a Number is Semiprime

All Sufficiently Large Squares, Represented as Sum of Two Semiprimes

relative size of most factors of semiprimes, close?

Semiprimes with three (and more) numbers

between two semiprimes differing by 4 there are two primes

primes and semiprimes found with $n=11,13,17,19 \mod 30$.

Mersenne semiprimes

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