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Task/Almost-prime/Racket/almost-prime.rkt

@@ -0,0 +1,25 @@
+#lang racket
+(require (only-in math/number-theory factorize))
+
+(define ((k-almost-prime? k) n)
+  (= k (for/sum ((f (factorize n))) (cadr f))))
+
+(define KAP-table-values
+  (for/list ((k (in-range 1 (add1 5))))
+    (define kap? (k-almost-prime? k))
+    (for/list ((j (in-range 10)) (i (sequence-filter kap? (in-naturals 1))))
+      i)))
+
+(define (format-table t)
+  (define longest-number-length
+    (add1 (order-of-magnitude (argmax order-of-magnitude (cons (length t) (apply append t))))))
+  (define (fmt-val v) (~a v #:width longest-number-length #:align 'right))
+  (string-join
+   (for/list ((r t) (k (in-naturals 1)))
+     (string-append
+      (format "║ k = ~a║ " (fmt-val k))
+      (string-join (for/list ((c r)) (fmt-val c)) "| ")
+      "║"))
+   "\n"))
+
+(displayln (format-table KAP-table-values))