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.

A053935 Squares composed of digits {2,8,9}.

Original entry on oeis.org

9, 289, 29929, 8898289, 88998998929, 2999882888289, 29292889289882992929, 99299899998229989289, 29222988989999289998222889, 299988829289888292222928892882898892999989922922289
Offset: 1

Views

Author

Patrick De Geest, Mar 15 2000

Keywords

Links

Crossrefs

Cf. A053934.

Formula

a(n) = A053934(n)^2. - Elmo R. Oliveira, Jul 18 2025

Extensions

More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 14 2005
One more term from Jon E. Schoenfield, Sep 04 2006
a(10) from Zhao Hui Du, Mar 10 2024

A378925 Positive numbers whose squares have at most one digit less than 8.

Original entry on oeis.org

1, 2, 3, 7, 9, 17, 83, 2983, 298327
Offset: 1

Views

Author

Zhining Yang, Dec 11 2024

Keywords

Comments

No terms > 298327 with less than 11 digits.
No terms > 298327 with less than 22 digits. - Michael S. Branicky, Dec 11 2024

Examples

			298327 is a term because 298327^2 = 88998998929 has only one digit that is less than 8.

Crossrefs

Cf. A053934, A360822, A378926, A378927.

Programs

  • Mathematica
    Select[Range[10^6], Count[IntegerDigits[#^2], _?(#1 < 8 &)] < 2 &]

A378926 Positive numbers whose squares have at most two digits less than 9.

Original entry on oeis.org

1, 2, 3, 4, 5, 6, 7, 8, 9, 13, 14, 17, 23, 27, 30, 31, 63, 77, 97, 173, 313
Offset: 1

Views

Author

Zhining Yang, Dec 11 2024

Keywords

Comments

No terms > 313 with less than 16 digits.
No terms > 313 with less than 1040 digits. - Michael S. Branicky, Dec 11 2024

Examples

			313 is a term because 313^2 = 97969 has only two digits that are less than 9.

Crossrefs

Cf. A053934, A360822, A378925, A378927.

Programs

  • Mathematica
    Select[Range[10^6], Count[IntegerDigits[#^2], _?(#1 < 9 &)] < 3&]

A378927 Positive numbers whose squares have at most three digits less than 9.

Original entry on oeis.org

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 33, 36, 37, 43, 44, 47, 53, 54, 57, 63, 64, 67, 70, 73, 77, 83, 86, 87, 89, 93, 95, 96, 97, 98, 99, 114, 173, 187, 223, 243, 263, 264, 303, 307, 313, 314, 315, 316, 437, 447, 547, 707, 964, 997, 1414, 2236, 2827, 3033, 3114, 3148, 3161
Offset: 1

Views

Author

Zhining Yang, Dec 11 2024

Keywords

Comments

No terms > 3161 with less than 16 digits.
No terms > 3161 with less than 101 digits. - Michael S. Branicky, Dec 11 2024

Examples

			3161 is a term because 3161^2 = 9991921 has only three digits that are less than 9.

Crossrefs

Cf. A053934, A360822, A378925, A378926.

Programs

  • Mathematica
    Select[Range[10^6], Count[IntegerDigits[#^2], _?(#1 < 9 &)] < 4 &]
Showing 1-4 of 4 results.

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

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