Binary Lambda Calculus - Esoteric programming language

Binary Lambda Calculus is an esoteric programming language created in 2004 by John Tromp.

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Binary lambda calculus (BLC) is a minimal, pure functional programming language invented by John Tromp in 2004,[1] based on a binary encoding of the untyped lambda calculus in De Bruijn index notation.

Binary Lambda Calculus website
Binary Lambda Calculus first developed in Centrum Wiskunde & Informatica
Binary Lambda Calculus on Esolang

Example from Riju:

001010100100100001100101011011000110110001101111001011000010
000001110111011011110111001001101100011001000010000100001010

Example from hello-world:

 Hello World