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.

A116193 Numbers k such that k concatenated with k+5 gives the product of two numbers which differ by 5.

Original entry on oeis.org

11, 45, 18281, 32769, 56891, 180689, 330539, 959481, 1850201, 3247409, 4940219, 2425563239, 2575561739, 6003563495, 7245212645, 7770160145, 4983798265289, 5049762270381, 5534298528989, 5603798594169, 21894082450101
Offset: 1

Views

Author

Giovanni Resta, Feb 06 2006

Keywords

Comments

Also numbers k such that k concatenated with k+9 gives the product of two numbers which differ by 3. For proof that this is the same sequence compare A116133.
Also numbers k such that k concatenated with k-9 gives the product of two numbers which differ by 9.

Examples

			7770160145//7770160136 = 8814851183 * 8814851192, where // denotes concatenation.

Crossrefs

Cf. A116205, A116187, A116349.
Cf. A116179, A115430, A116194, A116200, A116324.
Cf. A116099, A116109, A116231.

Extensions

Edited by N. J. A. Sloane, Apr 12 2007

A116230 n times n+7 gives the concatenation of two numbers m and m-9.

Original entry on oeis.org

80, 77394226, 89158932, 36623663376237623663376334, 37633762366336633762366234, 62366237633663366237633760, 63376336623762376336623660, 86194223018927804587702127
Offset: 1

Views

Author

Giovanni Resta, Feb 06 2006

Keywords

Examples

			89158932 * 89158939 = 79493157//79493148, where // denotes
concatenation.

Crossrefs

Cf. A116099, A116229, A116231, A116238.

A116240 n times n+9 gives the concatenation of two numbers m and m-8.

Original entry on oeis.org

93, 454, 538, 993, 7664, 9993, 72720, 99993, 356428, 643564, 999993, 9090909, 9999993, 35294117, 64705875, 99999993, 335664328, 664335664, 684210519, 818181818, 838056673, 846153846, 866028701, 980125138, 999999993
Offset: 1

Views

Author

Giovanni Resta, Feb 06 2006

Keywords

Crossrefs

Cf. A116109, A116231, A116239, A116245.
Showing 1-3 of 3 results.

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

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