A076063 Group the natural numbers so that the n-th group contains n numbers whose sum is a multiple of the n-th composite number: (4),(1,5),(2,3,11),(6,7,8,15),(9,10,12,13,16),(14,17,18,19,20,32)...

4, 1, 5, 2, 3, 11, 6, 7, 8, 15, 9, 10, 12, 13, 16, 14, 17, 18, 19, 20, 32, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 33, 34, 35, 50, 36, 37, 38, 39, 40, 41, 42, 43, 52, 44, 45, 46, 47, 48, 49, 51, 53, 54, 67, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 68, 69, 70, 71, 72

Offset

1,1

Links

Table of n, a(n) for n=1..72.

Example

4; 1,5; 2,3,11; 6,7,8,15; 9,10,12,13,16; 14,17,18,19,20,32; ...

Crossrefs

Cf. A076064, A076065, A076066, A076067.

Sequence in context: A269593 A194512 A131230 * A035590 A168230 A080414

Adjacent sequences: A076060 A076061 A076062 * A076064 A076065 A076066

Keyword

nonn,tabl

Author

Amarnath Murthy, Oct 05 2002

Extensions

More terms from David Wasserman, Mar 18 2005

Status

approved