twin-primes-upto ( n -- seq )

Vocabulary

math.primes.twins

Inputs

n

an object

Outputs

seq

an object

Definition

USING: grouping kernel math math.primes sequences ;

IN: math.primes.twins

: twin-primes-upto ( n -- seq )
    primes-upto 2 clump [ first2 - abs 2 = ] filter ;