APL (I'm using Dyalog APL)
Code:
{4=+/⎕d∊⍕⍵:⍵⋄∇⍵+1}
Tests:
{4=+/⎕d∊⍕⍵:⍵⋄∇⍵+1}7712 7801 {4=+/⎕d∊⍕⍵:⍵⋄∇⍵+1}1001 1023 {4=+/⎕d∊⍕⍵:⍵⋄∇⍵+1}2019 2019
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APL (I'm using Dyalog APL)
Code:
{4=+/⎕d∊⍕⍵:⍵⋄∇⍵+1}Tests:
{4=+/⎕d∊⍕⍵:⍵⋄∇⍵+1}7712 7801 {4=+/⎕d∊⍕⍵:⍵⋄∇⍵+1}1001 1023 {4=+/⎕d∊⍕⍵:⍵⋄∇⍵+1}2019 2019