A075643 Group the natural numbers so that the n-th group contains n numbers one each of a multiple of numbers from 1 to n so that the group sum is a multiple of (n+1): (2), (1, 8), (3, 4, 9), (5, 6, 12, 32), (7, 10, 15, 16, 30), (11, 14, 18, 20, 25, 24), ... Sequence gives initial terms of groups.

2, 1, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277

Offset

1,1

Comments

Is this the same sequence as A076074? - Andrew S. Plewe, Apr 30 2007

Links

Table of n, a(n) for n=1..60.

Crossrefs

Cf. A075644, A075645, A075646, A075647 (gives the list of groups).

Sequence in context: A127201 A225844 A006769 * A076074 A319153 A286390

Adjacent sequences: A075640 A075641 A075642 * A075644 A075645 A075646

Keyword

nonn

Author

Amarnath Murthy, Sep 30 2002

Extensions

More terms from David Wasserman, Jan 22 2005

Status

approved