Numbers k with property that sum of divisors of k-th triangular number is some m-th triangular number.

A175849

Numbers k with property that sum of divisors of k-th triangular number is some m-th triangular number.

Terms

    a(0) =1a(1) =8a(2) =9a(3) =215a(4) =458a(5) =520a(6) =2232a(7) =3251a(8) =3634a(9) =5349a(10) =9489a(11) =10051a(12) =10463a(13) =14072a(14) =14705a(15) =17463a(16) =27812a(17) =46552a(18) =55889a(19) =79614a(20) =100055a(21) =106941a(22) =110682a(23) =113839a(24) =119098a(25) =181690a(26) =197223a(27) =214600a(28) =270570a(29) =287585

External references