Difference of two positive 7th powers.

Terms

a(0) =0a(1) =127a(2) =2059a(3) =2186a(4) =14197a(5) =16256a(6) =16383a(7) =61741a(8) =75938a(9) =77997a(10) =78124a(11) =201811a(12) =263552a(13) =277749a(14) =279808a(15) =279935a(16) =543607a(17) =745418a(18) =807159a(19) =821356a(20) =823415a(21) =823542a(22) =1273609a(23) =1817216a(24) =2019027a(25) =2080768a(26) =2094965a(27) =2097024a(28) =2097151a(29) =2685817