Form triangle shown below, in which the n-th row contains n terms of an arithmetic progression with first term 1 and common difference n. Then a(n) = terms of the n-th row (mod 10), concatenated.

A110748

Form triangle shown below, in which the n-th row contains n terms of an arithmetic progression with first term 1 and common difference n. Then a(n) = terms of the n-th row (mod 10), concatenated.

Terms

    a(0) =1a(1) =13a(2) =147a(3) =1593a(4) =16161a(5) =173951a(6) =1852963a(7) =19753197a(8) =109876543a(9) =1111111111a(10) =12345678901a(11) =135791357913

External references