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 1-10 of 10 results.

A048539 a(n) is the smallest value of m such that A002378(m), the m-th oblong number, contains exactly n 5's.

Original entry on oeis.org

7, 23, 74, 2248, 2292, 23506, 50552, 742667, 2357022, 22706949, 74555050, 703955648, 745020507, 3996943276, 74333434976, 244040827632, 505525029504, 5963015642907, 23548897033949, 156701172827632, 745354652534976, 758666893673274, 7453694087868501, 77198164845775648, 505525028614365003
Offset: 1

Views

Author

Patrick De Geest, May 15 1999

Keywords

Links

Crossrefs

Cf. A048540, A002378.
Cf. A048529, A048531, A048533, A048535, A048537, A048541, A048543, A048545, A048547.

Extensions

a(14)-a(16) from Lars Blomberg, Jun 10 2011
a(17) added and name edited by Giovanni Resta, Oct 09 2019
a(18)-a(25) from Max Alekseyev, Jul 25 2024

A048544 Smallest oblong (promic) number containing exactly n 7's.

Original entry on oeis.org

72, 11772, 771762, 757770, 77677782, 779777700, 7077772770, 778777127772, 7777770777090, 57777777767730, 7777577077877756, 177677777977777980, 17673737777477771772, 677777977779775677756, 1789771777777771777710, 7747977777770507777772, 298777877777767737777770
Offset: 1

Views

Author

Patrick De Geest, May 15 1999

Keywords

Links

Crossrefs

Cf. A048543, A002378.
Cf. A048530, A048532, A048534, A048536, A048538, A048540, A048542, A048546, A048548.

Programs

  • Mathematica
    With[{pn=2*Accumulate[Range[430000000]]},Table[Select[pn,DigitCount[#,10,7] == n&,1],{n,12}]]//Flatten (* Harvey P. Dale, Aug 14 2017 *)
  • Python
    def A048544(n):
    k, m = 1, 2
    while True:
        if str(m).count('7') == n:
            return m
        k += 1
        m += 2*k # Chai Wah Wu, Mar 23 2018

Extensions

a(13)-a(17) from Giovanni Resta, Oct 09 2019

A048530 Smallest oblong (promic) number containing exactly n 0's.

Original entry on oeis.org

0, 600, 10100, 390000, 1001000, 100030002, 100010000, 10000300002, 10000100000, 1000003000002, 1000001000000, 100000030000002, 100000010000000, 10000000300000002, 10000000100000000
Offset: 1

Views

Author

Patrick De Geest, May 15 1999

Keywords

Links

Crossrefs

Cf. A048529, A002378.
Cf. A048532, A048534, A048536, A048538, A048540, A048542, A048544, A048546, A048548.

A048532 Smallest oblong (promic) number containing exactly n 1's.

Original entry on oeis.org

12, 110, 11130, 1021110, 104111412, 1151143112, 11141119152, 112311111512, 1111191111030, 151611114111162, 10115118111141192, 111017111111636112, 1111111811261716110, 18161111191151111150, 911115011111211111170, 17711116111217141111112, 110111041311117211111110
Offset: 1

Views

Author

Patrick De Geest, May 15 1999

Keywords

Links

Crossrefs

Cf. A048531, A002378.
Cf. A048530, A048534, A048536, A048538, A048540, A048542, A048544, A048546, A048548.

Extensions

a(13)-a(17) from Giovanni Resta, Oct 09 2019

A048534 Smallest oblong (promic) number containing exactly n 2's.

Original entry on oeis.org

2, 272, 20022, 210222, 2127222, 112222242, 1329222222, 222721228422, 222222202620, 12225222042222, 222922622262242, 22222622629269222, 222262242222052122, 22222222222226402, 222222624222746822222, 13222522222222257222852, 222222225263222925292272
Offset: 1

Views

Author

Patrick De Geest, May 15 1999

Keywords

Links

Crossrefs

Cf. A048533, A002378.
Cf. A048530, A048532, A048536, A048538, A048540, A048542, A048544, A048546, A048548.

Extensions

a(15)-a(17) from Giovanni Resta, Oct 09 2019

A048536 Smallest oblong (promic) number containing exactly n 3's.

Original entry on oeis.org

30, 1332, 33306, 3303306, 23333730, 33333302, 23433333320, 333339373380, 13393363833330, 337333336323132, 33333334306433532, 332333844339333332, 3383333633731033332, 313337139333377333330, 1335333331339333343030, 236133338333333323833132, 3293333837330583333333332
Offset: 1

Views

Author

Patrick De Geest, May 15 1999

Keywords

Links

Crossrefs

Cf. A048535, A002378.
Cf. A048530, A048532, A048534, A048538, A048540, A048542, A048544, A048546, A048548.

Extensions

a(13)-a(17) from Giovanni Resta, Oct 09 2019

A048538 Smallest oblong (promic) number containing exactly n 4's.

Original entry on oeis.org

42, 4422, 46440, 464442, 44642442, 144444342, 40447444340, 2344449414440, 42794944444440, 443448440044440, 24442434644444460, 455758444444444440, 34444442714441644442, 44441704844441444442, 14444904404444444646450, 344407444483444494444942, 1244444414842444444444506
Offset: 1

Views

Author

Patrick De Geest, May 15 1999

Keywords

Links

Crossrefs

Cf. A048537, A002378.
Cf. A048530, A048532, A048534, A048536, A048540, A048542, A048544, A048546, A048548.

Extensions

a(13)-a(17) from Giovanni Resta, Oct 09 2019

A048542 Smallest oblong (promic) number containing exactly n 6's.

Original entry on oeis.org

6, 3660, 66306, 666672, 16666806, 6066462656, 66686606406, 666692662656, 20666666069660, 666676608666642, 10666051666666662, 664566666660662640, 666626669666607656, 6666086666606866662, 616766666966468666660, 66636666164666636562656, 1536666668666666766166056
Offset: 1

Views

Author

Patrick De Geest, May 15 1999

Keywords

Links

Crossrefs

Cf. A048541, A002378.
Cf. A048530, A048532, A048534, A048536, A048538, A048540, A048544, A048546, A048548.

Extensions

a(14)-a(17) from Giovanni Resta, Oct 09 2019

A048546 Smallest oblong (pronic) number containing exactly n 8's.

Original entry on oeis.org

182, 12882, 785882, 8188182, 84888582, 8808854880, 88835888862, 1848888788382, 8808848888870, 685888888859880, 48480888828288882, 187888888887248880, 11988898088888888862, 838843888888078888782, 1888988803808888888862, 521878088188888888888860, 888889828881888888587832
Offset: 1

Views

Author

Patrick De Geest, May 15 1999

Keywords

Links

Crossrefs

Cf. A048545, A002378.
Cf. A048530, A048532, A048534, A048536, A048538, A048540, A048542, A048544, A048548.

Extensions

a(13)-a(17) from Giovanni Resta, Oct 09 2019
Typo in definition corrected by Harvey P. Dale, Jan 11 2025

A048548 Smallest oblong (promic) number containing exactly n 9's.

Original entry on oeis.org

90, 992, 792990, 4992990, 199699292, 919999892, 29939899992, 939969999920, 99179499990990, 999690999669990, 129990929999959950, 299899968999993990, 10999489909979999990, 299929969229995999992, 12999999959999499709890, 126994909999399899999990, 9399899999156999909995992
Offset: 1

Views

Author

Patrick De Geest, May 15 1999

Keywords

Links

Crossrefs

Cf. A048547, A002378.
Cf. A048530, A048532, A048534, A048536, A048538, A048540, A048542, A048544, A048546.

Extensions

a(13)-a(17) from Giovanni Resta, Oct 09 2019
Showing 1-10 of 10 results.

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