A079042 - OEIS

A079042

Numbers n in which the first k digits of n form an integer divisible by k^2, for k = 1, 2, ..., m, where m is the number of digits in n.

1, 2, 3, 4, 5, 6, 7, 8, 9, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60, 64, 68, 72, 76, 80, 84, 88, 92, 96, 126, 162, 207, 243, 288, 324, 360, 369, 405, 441, 486, 522, 567, 603, 648, 684, 720, 729, 765, 801, 846, 882, 927, 963, 1264, 2432, 2880, 3248, 3600, 3696

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OFFSET

1,2

LINKS

Table of n, a(n) for n=1..61.

EXAMPLE

a(86) = 6480005 because 6 is divisible by 1^2, 64 by 2^2, 648 by 3^2, 6480 by 4^2, 64800 by 5^2, 648000 by 6^2, 6480005 by 7^2.

CROSSREFS

Cf. A079041.

Sequence in context: A064653 A130588 A079238 * A193455 A356349 A343680

Adjacent sequences: A079039 A079040 A079041 * A079043 A079044 A079045

KEYWORD

easy,fini,full,nonn,base

AUTHOR

Sudipta Das (juitech(AT)vsnl.net), Feb 01 2003

STATUS

approved