function Invoke-SPERemoteScriptForPropertyTableValue {
  Param([string]$propertyTableKey)

  $hashValue = -1
  $script = {
    $db = Get-Database "core"
    $previousValue = $db.Properties.GetLongValue($using:propertyTableKey, -1000)

    $previousValue
  }

  $session = New-ScriptSession -Username $User -Password $Pass -ConnectionUri $Url
  $myValue = Invoke-RemoteScript -Session $session -ScriptBlock $script -ErrorAction Stop -Verbose
  Stop-ScriptSession  -Session $session
  $session = $null

  return $myValue
}

function Invoke-Script($propertyKeys)
{
  foreach ($propertyKey in $propertyKeys)
  {
    $propertyValue = Invoke-SPERemoteScriptForPropertyTableValue $propertyKey
    Write-Host "Property Value for Key $propertyKey is $propertyValue"
  }
}

$User = $OctopusParameters['SitecoreUserName']
$Pass = $OctopusParameters['SitecoreUserPassword']
$Url = $OctopusParameters['Url']
$myArray = "Prop1", "Prop2","Prop3"

Invoke-Script $myArray