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.

A048543 a(n) is the smallest value of m such that A002378(m), the m-th oblong number, contains exactly n 7's.

Original entry on oeis.org

8, 108, 878, 870, 8813, 27924, 84129, 882483, 2788865, 7601169, 88190572, 421518419, 4204014483, 26034169427, 42305694389, 88022598108, 546605779129, 2788866736108, 69048807207508, 98844816642745, 88187696578, 2516, 5270458024477168, 26772616052167516, 166654612230648203, 521323093463907254
Offset: 1

Views

Author

Patrick De Geest, May 15 1999

Keywords

Examples

			From _Jesse Sealand_, Oct 05 2019: (Start)
a(1) = 8 since A002378(8) = 72;
a(2) = 108 since A002378(36) = 11772;
a(3) = 878 since A002378(182) = 771762;
a(4) = 870 since A002378(1817) = 757770, etc. (End)
		

Crossrefs

Programs

  • Python
    def A048543(n):
        k, m = 1, 2
        while True:
            if str(m).count('7') == n:
                return k
            k += 1
            m += 2*k # Chai Wah Wu, Mar 23 2018

Extensions

a(13)-a(16) from Lars Blomberg, Jun 10 2011
Name edited by Jesse Sealand, Oct 05 2019
a(17) from Giovanni Resta, Oct 09 2019
a(18)-a(25) from Max Alekseyev, Jul 25 2024

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

Crossrefs

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

Crossrefs

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

Crossrefs

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

Crossrefs

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

Crossrefs

Extensions

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

A048540 Smallest oblong (promic) number containing exactly n 5's.

Original entry on oeis.org

56, 552, 5550, 5055752, 5255556, 552555542, 2555555256, 551555015556, 5555555065506, 515605555595550, 5558455555057550, 495553555055055552, 555055556595557556, 15975555555558555452, 5525459555405553555552, 59555925551555575555056, 255555555455525595515520
Offset: 1

Views

Author

Patrick De Geest, May 15 1999

Keywords

Crossrefs

Extensions

a(14)-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

Crossrefs

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

Crossrefs

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

Crossrefs

Extensions

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