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.

A116187 Numbers k such that k concatenated with k+4 gives the product of two numbers which differ by 6.

Original entry on oeis.org

12, 43, 20440836, 30017751, 61336887, 52400871197755334426147587, 53651708763838760619655612, 56652002793835820319625612, 57952296063256269823192087, 17684775866714240650923831481623
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 4. For proof that this is the same sequence compare A116133.

Examples

			61336887//61336891 = 78317867 * 78317873, where // denotes concatenation. 61336887//61336896 = 78317868 * 78317872.
		

Crossrefs

Extensions

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

A116337 Numbers k such that k*(k+4) gives the concatenation of two numbers m and m+7.

Original entry on oeis.org

8217108, 8030443878983905982, 43467818511541680701794365325328847002052, 56532181488458319298205634674671152997945
Offset: 1

Views

Author

Giovanni Resta, Feb 06 2006

Keywords

Examples

			8217108 * 8217112 = 6752089//6752096, where // denotes concatenation.
		

Crossrefs

A116349 Numbers k such that k*(k+3) gives the concatenation of two numbers m and m+9.

Original entry on oeis.org

32, 66, 42755, 57243, 75425, 425074, 574924, 979530, 4301395, 5698603, 7028668, 4925000749, 5074999249, 7748266576, 8511881486, 8814851186, 7059602159674, 7106167933830, 7439286611623, 7485852385779, 46791112884927
Offset: 1

Views

Author

Giovanni Resta, Feb 06 2006

Keywords

Crossrefs

A116351 Numbers k such that k*(k+5) gives the concatenation of two numbers m and m+9.

Original entry on oeis.org

8446, 8811, 69125298546226023972, 69855225553525294045, 74604750601020544520, 75334677608319814593, 92496418993920707747, 93226346001219977820, 97975871048715228295, 98705798056014498368
Offset: 1

Views

Author

Giovanni Resta, Feb 06 2006

Keywords

Examples

			8811 * 8816 = 7767//7776, where // denotes concatenation.
		

Crossrefs

Showing 1-4 of 4 results.