Extra Perfect Numbers (Special Numbers Series #7).js

/*
Description:
Definition
Extra perfect number is the number that first and last bits are set bits.

Task
Given a positive integer N , Return the extra perfect numbers in range from 1 to N .

Warm-up (Highly recommended)
Playing With Numbers Series
Notes
Number passed is always Positive .

Returned array/list should contain the extra perfect numbers in ascending order from lowest to highest

Input >> Output Examples
1- extraPerfect(3)  ==>  return {1,3}
Explanation:
(1)10 =(1)2
First and last bits as set bits.

(3)10 = (11)2
First and last bits as set bits.

2- extraPerfect(7)  ==>  return {1,3,5,7}
Explanation:
(5)10 = (101)2
First and last bits as set bits.

(7)10 = (111)2
First and last bits as set bits.
*/

function extraPerfect(n){
  let arr=[1];
  for (let i=3;i<=n;i+=2)
  arr.push(i)
  return arr 
}