Terms of A073872 that do not change their position in the rearrangement; i.e., values of A073872(n) which equal n(n+1)/2.

A073873

Terms of A073872 that do not change their position in the rearrangement; i.e., values of A073872(n) which equal n(n+1)/2.

Terms

    a(0) =1a(1) =45a(2) =325a(3) =1225a(4) =1653a(5) =2145a(6) =3321a(7) =3655a(8) =4371a(9) =7381a(10) =8911a(11) =11781a(12) =14365a(13) =17205a(14) =20301a(15) =21945a(16) =23653a(17) =25425a(18) =32131a(19) =34191a(20) =41905a(21) =44253a(22) =45451a(23) =46665a(24) =47895a(25) =54285a(26) =55611a(27) =59685a(28) =65341a(29) =68265

External references