`math-get-from-counter' to a string before calling `concat' on it.
(math-mul val (list 'calcFunc-an var-GenCount))
(setq var-GenCount (math-add var-GenCount 1))
(calc-refresh-evaltos 'var-GenCount))
- (let* ((var (concat "n" (math-get-from-counter 'solve-int)))
+ (let* ((var (concat "n" (int-to-string
+ (math-get-from-counter 'solve-int))))
(var2 (list 'var (intern var) (intern (concat "var-" var)))))
(if (and range (eq solve-full 'all))
(setq math-solve-ranges (cons (cons var2