Positive numbers k such that the decimal expansion of k^2 appears in the concatenation of the first k positive integers.

A343536

Positive numbers k such that the decimal expansion of k^2 appears in the concatenation of the first k positive integers.

Terms

    a(0) =1a(1) =428a(2) =573a(3) =725a(4) =727a(5) =738a(6) =846a(7) =7810a(8) =8093a(9) =28023a(10) =36354a(11) =36365a(12) =36464a(13) =63636a(14) =254544a(15) =277851a(16) =297422a(17) =326734a(18) =673267a(19) =673368a(20) =2889810a(21) =4545454a(22) =4545465a(23) =5454547a(24) =5454646a(25) =24275425a(26) =29411775a(27) =47058823a(28) =52941178a(29) =94117748

External references