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.

A116133 Numbers k such that k concatenated with k-4 gives the product of two numbers which differ by 9.

Original entry on oeis.org

64, 1876, 3214, 8776, 17227120144584448354, 19391087990479091186, 21557280540171744040, 23970390649400564404, 26051259424903756364, 28697643366269876506, 31320461807899711990, 34215988012600009664
Offset: 1

Views

Author

Giovanni Resta, Feb 06 2006

Keywords

Comments

Also numbers k such that k concatenated with k+4 gives the product of two numbers which differ by 7.
Since k*(10^j+1) + 4 = m*(m+7) iff k*(10^j+1) - 4 = m*(m+7) - 8 = (m-1)*(m+8) = M*(M+9) this is trivially the same sequence. - N. J. A. Sloane, Apr 11 2007

Examples

			8776//8772 = 9364 * 9373, where // denotes concatenation. Also 8776//8780 = 9365 * 9372.

Crossrefs

Cf. A116132, A116140, A116264.
Cf. A116180, A116187, A116189, A116195, A116319.

Extensions

Edited by N. J. A. Sloane, Apr 11 2007

A116263 n times n+7 gives the concatenation of two numbers m and m-4.

Original entry on oeis.org

83, 76980, 714687, 952311, 90438188, 96320541, 32980078899026, 34346653774235, 42816188292270, 42881990066485, 57118009933509, 57183811707724, 65653346225759, 67019921100968, 81321742742207
Offset: 1

Views

Author

Giovanni Resta, Feb 06 2006

Keywords

Examples

			96320541 * 96320548 = 92776472//92776468, where // denotes
concatenation.

Crossrefs

Cf. A116132, A116250, A116262, A116264, A116269.

A116258 Numbers k such that k*(k+9) gives the concatenation of two numbers m and m-5.

Original entry on oeis.org

8444, 8809, 69125298546226023970, 69855225553525294043, 74604750601020544518, 75334677608319814591, 92496418993920707745, 93226346001219977818, 97975871048715228293, 98705798056014498366
Offset: 1

Views

Author

Giovanni Resta, Feb 06 2006

Keywords

Examples

			8809 * 8818 = 7767//7762, where // denotes concatenation.

Crossrefs

Cf. A116180, A116245, A116257, A116264.

A116271 n times n+9 gives the concatenation of two numbers m and m-3.

Original entry on oeis.org

4, 8600, 9422, 35440, 64552, 73643, 4851411, 5148581, 8784945, 726216462984, 753613723258, 791909893641, 819307153915, 3654754464602947512, 4527063717215234298, 5472936282784765694, 6345245535397052480
Offset: 1

Views

Author

Giovanni Resta, Feb 06 2006

Keywords

Examples

			8784945 * 8784954 = 7717533//7717530, where // denotes
concatenation.

Crossrefs

Cf. A116140, A116264, A116270, A116278.
Showing 1-4 of 4 results.

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

Content is available under The OEIS End-User License Agreement.