number-theory on S Anand

Special numbers

Tue, 08 Mar 2005 12:00:00 +0000

Every number is special. Here’s what’s special about the first 10,000 numbers (almost). For instance, “8281 is the only 4-digit square whose two 2-digit pairs are consecutive.” And “5851 is the only prime so that it, its square, and its cube all have the same sum of digits.”

Prime factorisation algorithm

Sun, 10 Nov 2002 12:00:00 +0000

An update on the IIT-K prime factorisation algorithm. via Matthai Markose

Polynomial-time computability of prime numbers

Tue, 27 Aug 2002 12:00:00 +0000

Progress on the polynomial-time computability of prime numbers.

Encyclopaedia of integer sequences

Tue, 16 Apr 2002 12:00:00 +0000

Encyclopaedia of integer sequences. Funny, it couldn’t find “1,2,3,4,5,6…” though.