A098733 Consider the sequence {b(n), n >= 1} of digits of the natural (or counting) numbers: 1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0... (A007376); a(n) = n*b(n).

1, 4, 9, 16, 25, 36, 49, 64, 81, 10, 0, 12, 13, 14, 30, 16, 51, 18, 76, 20, 105, 22, 138, 24, 175, 26, 216, 28, 261, 60, 0, 64, 33, 68, 70, 72, 111, 76, 156, 80, 205, 84, 258, 88, 315, 92, 376, 96, 441, 150, 0, 156, 53, 162, 110, 168, 171, 174, 236, 180, 305, 186, 378, 192

Offset

1,2

Links

Table of n, a(n) for n=1..64.

Crossrefs

Cf. A098727, etc.

Sequence in context: A153211 A118881 A277342 * A068522 A048385 A230101

Adjacent sequences: A098730 A098731 A098732 * A098734 A098735 A098736

Keyword

base,easy,nonn

Author

Alexandre Wajnberg, Sep 30 2004

Extensions

More terms from Joshua Zucker, May 18 2006

Status

approved