The index of the first of two consecutive positive triangular numbers (A000217) the sum of which is equal to the sum of thirteen consecutive positive triangular numbers.

A262492

The index of the first of two consecutive positive triangular numbers (A000217) the sum of which is equal to the sum of thirteen consecutive positive triangular numbers.

Terms

    a(0) =25a(1) =90a(2) =207a(3) =1117a(4) =2560a(5) =9255a(6) =21202a(7) =114022a(8) =261195a(9) =944020a(10) =2162497a(11) =11629227a(12) =26639430a(13) =96280885a(14) =220553592a(15) =1186067232a(16) =2716960765a(17) =9819706350a(18) =22494303987a(19) =120967228537a(20) =277103358700

External references