a(n) is the least integer that can be expressed as the difference of two n-gonal numbers in exactly n ways.

A338105

a(n) is the least integer that can be expressed as the difference of two n-gonal numbers in exactly n ways.

Terms

    a(0) =9a(1) =96a(2) =1330a(3) =4725a(4) =21021a(5) =22400a(6) =421515a(7) =675675a(8) =5370365a(9) =576576a(10) =10790325a(11) =39255125a(12) =51548805a(13) =7286400a(14) =978624647a(15) =144729585a(16) =649593945a(17) =125245120a(18) =1109593485a(19) =4519064403a(20) =13908638315a(21) =253955520a(22) =8860666815a(23) =30587913125a(24) =33144736086a(25) =859541760a(26) =147839441750

External references