A075621 - OEIS

A075621

Group the natural numbers so that the n-th group contains n numbers whose concatenation is divisible by n: (1), (2, 4), (3, 5, 7), (6, 8, 9, 12), (10, 11, 13, 14, 15), (16, 17, 18, 19, 20, 24), ... Sequence gives numbers formed by the concatenation.

%I #2 Dec 05 2013 19:55:39

%S 1,24,357,68912,1011131415,161718192024,21222325262733,

%T 2829303132343536,373839404142434445,46474849505152535460,

%U 5556575859616263646571,666768697072737475767780,787981828384858687888990110,919293949596979899100101102103112

%N Group the natural numbers so that the n-th group contains n numbers whose concatenation is divisible by n: (1), (2, 4), (3, 5, 7), (6, 8, 9, 12), (10, 11, 13, 14, 15), (16, 17, 18, 19, 20, 24), ... Sequence gives numbers formed by the concatenation.

%Y Cf. A075622, A075623, A075624, A075625.

%K base,nonn

%O 1,2

%A _Amarnath Murthy_, Sep 30 2002

%E More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 29 2003