Blogogram

Fulcrum Numbers A Square Deal Niranjan Ramakrishnan Did you ever notice that the difference between successive squares is arithmetica...

Divisibility Formula for Numbers Ending in 5  - Proof Niranjan Ramakrishnan July 9, 2018 The previous post gave an empirical formula t...

The Divisibility Rule for Numbers ending in 5 Niranjan Ramakrishnan June 2, 2018 A previous post, Divisibility - A more general approac...

Divisibility by Numbers ending in 1, 3, 7, and 9 - Proofs of the Formulas Niranjan Ramakrishnan May 15, 2018 The previous post provi...

Divisibility - A more general approach Niranjan Ramakrishnan May 8, 2018 Everyone is taught some basic rules for checking if a number is...

Two royals seeing eye to eye by Niranjan Ramakrishnan Shortly after news  of Pataudi's death, a friend of mine sent me the ...

The Food Bandits " The number of hungry people has soared to nearly 1 billion, despite strong global harvests ... Just four compan...