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 1-4 of 4 results.

A088870 Numbers n which are divisors of the number produced by concatenating (n-5), (n-4), ... (n-1) in that order.

Original entry on oeis.org

13677, 14647, 21291, 29567, 43941, 69031, 88701, 105991, 126507, 317973, 156304482823, 468913448469, 21729950852487, 2212933498428421, 6638800495285263, 12049739358792173, 36149218076376519, 11316117499289108644863
Offset: 1

Views

Author

Chuck Seggelin, Oct 20 2003

Keywords

Examples

			a(1)=13677 because 13677 is a factor of 1367213673136741367513676.

Crossrefs

Cf. A069860, A088797, A088798, A088799, A088800, A088868, A088869, A088871, A088872.

Extensions

More terms from David Wasserman, Aug 26 2005

A088872 Numbers n which are divisors of the number produced by concatenating (n-10), (n-9), (n-8), ... (n-1) in that order.

Original entry on oeis.org

37, 1793, 12247, 13061, 12345679, 17675669, 59454523, 10035074789, 11207086103, 12174047803, 13606288721, 14036302277, 17989804447, 19541987747, 20070727459, 21841045129, 22431989513, 23140930781, 32217871691
Offset: 1

Views

Author

Chuck Seggelin, Oct 20 2003

Keywords

Examples

			a(1)=37 because 37 is a factor of 27282930313233343536.

Crossrefs

Cf. A069860, A088797, A088798, A088799, A088800, A088868, A088869, A088870, A088871.

Extensions

More terms from David Wasserman, Aug 25 2005

A088871 Numbers n which are divisors of the number produced by concatenating (n-1), (n-2), ... (n-10) in that order.

Original entry on oeis.org

10, 22, 55, 181, 190, 362, 905, 2035, 4070, 10490, 11203, 14686, 17833, 22406, 23065, 35666, 36715, 46130, 56015, 73430, 78421, 89165, 100705, 201410, 1004530, 1093165, 1425313, 1480309, 1695710, 1956190, 2186330, 2850626, 2882707
Offset: 1

Views

Author

Chuck Seggelin, Oct 20 2003

Keywords

Examples

			a(2)=22 because 22 is a factor of 21201918171615141312.

Crossrefs

Cf. A069860, A088797, A088798, A088799, A088800, A088868, A088869, A088870, A088872.

Extensions

More terms from David Wasserman, Aug 26 2005

A088885 Minimum number of consecutive previous nonnegative integers to n that must be concatenated together in descending order such that n divides the concatenated term, or zero if n divides no such concatenation.

Original entry on oeis.org

1, 2, 2, 2, 5, 2, 0, 6, 8, 10, 0, 6, 0, 8, 5, 4, 2, 8, 3, 0, 0, 10, 0, 12, 0, 0, 26, 16, 0, 20, 0, 20, 11, 2, 20, 8, 0, 0, 0, 20, 40, 20, 4, 32, 35, 46, 38, 20, 40, 0, 2, 0, 0, 26, 10, 20, 3, 0, 0, 20, 55, 0, 0, 52, 0, 32, 0, 44, 17, 20, 0, 36, 26, 0, 50, 52, 21, 38, 67, 20, 0, 0, 9, 20, 0, 4, 59
Offset: 1

Views

Author

Chuck Seggelin, Oct 29 2003

Keywords

Comments

Concatenation always begins at n-1 and cannot go further than n-n (zero). Hence the maximum value of a(n) is n.

Examples

			a(8) = 6 because will divide the number formed by concatenating the 6 integers prior to 8 in descending order (i.e. 765432). 8 will not divide any lesser number of previous terms concatenated together beginning with 7 (i.e. 8 will not divide 7, 76, 765, 7654, or 76543). a(7) = 0 because 7 will not divide 6, 65, 654, 6543, 65432, 654321, or 6543210.

Crossrefs

Cf. A088798, A088800, A088869, A088871, A088886.
Showing 1-4 of 4 results.

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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