028.io (268B)
1 #!/usr/local/bin/io 2 3 nextFour := method(current, step, 4 list(1, 2, 3, 4) map(v, current + (step * v)) 5 ) 6 7 current := 1 8 sum := current 9 10 for(step, 2, 1000, 2, 11 theseFour := nextFour(current, step) 12 current = theseFour last 13 sum = sum + (theseFour sum) 14 ) 15 16 sum println