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.

A060810 Numbers whose squares have their digits in strictly increasing order.

Original entry on oeis.org

0, 1, 2, 3, 4, 5, 6, 7, 13, 16, 17, 37, 116, 117, 367
Offset: 1

Views

Author

Erich Friedman, Apr 29 2001

Keywords

Examples

			117^2 = 13689 and 1 < 3 < 6 < 8 < 9.

Crossrefs

Cf. A122683.

Programs

  • Mathematica
    Select[Range[0,400],Min[Differences[IntegerDigits[#^2]]]>0&] (* Harvey P. Dale, Oct 06 2024 *)

Formula

a(n) = sqrt(A122683(n)).

A235597 Squares in which each digit exceeds the previous digit by more than one.

Original entry on oeis.org

0, 1, 4, 9, 16, 25, 36, 49, 169, 1369
Offset: 1

Views

Author

N. J. A. Sloane, Jan 16 2014, following a suggestion from Vincenzo Librandi

Keywords

Examples

			256 is not a term because 6-5=1.

Crossrefs

A subsequence of A122683.

Programs

  • Mathematica
    Select[Range[0, 40]^2, Min[Differences[IntegerDigits[#]]]>1&] (* Vincenzo Librandi, Jan 17 2014 *)

A124683 Squares with strictly decreasing digits.

Original entry on oeis.org

0, 1, 4, 9, 64, 81, 841, 961
Offset: 1

Views

Author

Tanya Khovanova, Dec 24 2006

Keywords

Crossrefs

Cf. A122683 = squares with increasing digits. Subsequence of A028822 = squares with digits in descending order.

Extensions

0 inserted by Jon E. Schoenfield, Jan 15 2014
Showing 1-3 of 3 results.

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

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