numbers ∕ four-digit numbers 61xxtable of four-digit numbers ⫽ 6100 ― 619961x061x161x261x361x461x561x661x761x861x96100610161026103610461056106610761086109611061116112611361146115611661176118611961206121612261236124612561266127612861296130613161326133613461356136613761386139614061416142614361446145614661476148614961506151615261536154615561566157615861596160616161626163616461656166616761686169617061716172617361746175617661776178617961806181618261836184618561866187618861896190619161926193619461956196619761986199
@ifckr.v.0.