cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

Showing 1-3 of 3 results.

A073893 a(10k) = 0 and if n is not a multiple of 10 then a(n) is the smallest positive integer such that the concatenation of the first n terms is a multiple of n.

Original entry on oeis.org

1, 2, 3, 2, 5, 2, 5, 6, 1, 0, 8, 4, 9, 4, 5, 6, 25, 2, 15, 0, 15, 10, 28, 16, 25, 16, 28, 16, 13, 0, 14, 4, 22, 36, 5, 16, 35, 14, 47, 0, 16, 8, 42, 28, 35, 18, 49, 44, 27, 0, 42, 4, 26, 6, 45, 52, 53, 38, 62, 0, 44, 50, 25, 28, 15, 32, 43, 72, 29, 0, 61, 44, 45, 8, 25, 56, 82, 84, 85, 0
Offset: 1

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Author

Amarnath Murthy, Aug 17 2002

Keywords

Comments

Note that the concatenation of the first 10k terms is not necessarily a multiple of 10k.

Crossrefs

Cf. A051883, A073894, A099552.

Extensions

Edited and extended by David Wasserman, Oct 21 2004

A083804 a(1) = 1. If the (n-1)th partial concatenation is divisible by n then a(n) = 0. Otherwise, a(n) is the smallest positive number such that the n-th partial concatenation is divisible by n.

Original entry on oeis.org

1, 2, 0, 0, 0, 0, 3, 2, 1, 10, 0, 8, 16, 8, 15, 20, 9, 4, 24, 20, 13, 28, 25, 28, 25, 30, 32, 20, 9, 10, 27, 2, 16, 10, 5, 36, 26, 10, 33, 20, 33, 46, 26, 28, 30, 50, 4, 48, 13, 50, 3, 12, 12, 6, 30, 64, 53, 56, 61, 60, 69, 36, 12, 8, 65, 74, 66, 4, 44, 20, 3, 76, 31, 62, 75, 6, 85, 56
Offset: 1

Views

Author

Amarnath Murthy, May 08 2003

Keywords

Examples

			1,12,120,1200,12000,120000 1200003 etc. are multiples of 1,2,3,4,5,6 and 7 respectively.

Crossrefs

Cf. A083805.
Cf. A051883, A073894, A099552.

Extensions

Corrected and extended by David Wasserman, Nov 30 2004

A084396 a(1) = 1; then numbers in increasing order such that the n-th partial concatenation is divisible by n.

Original entry on oeis.org

1, 2, 3, 6, 10, 14, 19, 20, 24, 30, 33, 36, 44, 56, 65, 76, 89, 102, 115, 120, 131, 148, 163, 184, 200, 208, 225, 244, 248, 270, 283, 296, 303, 316, 335, 360, 393, 410, 421, 440, 460, 498, 541, 544, 550, 594, 612, 624, 661, 700, 751, 760, 771, 818, 855, 904, 923
Offset: 1

Views

Author

Amarnath Murthy, May 31 2003

Keywords

Examples

			a(4) = 6 and 1236 is a multiple of 4.

Crossrefs

Cf. A084397.
Cf. A051883, A073894.

Extensions

More terms from David Wasserman, Dec 21 2004
Showing 1-3 of 3 results.

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