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 1-6 of 6 results.

A079350 "Look and Say" (or LS) transform of A079342(n). These terms are such that A079342(n) divides a(n).

Original entry on oeis.org

11, 12, 15, 1110, 22, 1312, 1612, 1911, 111813, 1128, 111910, 111916, 121518, 121716, 2310, 161711, 171110, 211310, 11121110, 11151710, 121624, 122918, 13121912, 14121114, 11171025, 12201315, 1513101115, 1710131115, 111011101110
Offset: 1

Views

Author

Mark Hudson (mrmarkhudson(AT)hotmail.com), Feb 13 2003

Keywords

Examples

			E.g. 91 is in A079342, 1911=LS(91) and 91 divides 1911; 17055 is in A079342, 11171025=LS(17055) and 17055 divides 11171025. LS(n) is the "Look and Say" transform of n.

Crossrefs

For LS(n) see A045918. Cf. A056815, A005150, A079562, A079342.

Extensions

Revised Aug 13 2004

A131510 Erroneous version of A079342.

Original entry on oeis.org

1, 2, 5, 22, 32, 62, 91, 183, 188, 190, 196, 258, 276, 330, 671, 710, 1130, 1210, 1570, 2644, 2998
Offset: 1

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Author

Keywords

A079341 Triangular array read by rows: GCDs of entries in A010940.

Original entry on oeis.org

1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 24, 12, 8, 6, 24, 4, 24, 3, 8, 24, 24, 4, 276, 92, 138, 276, 92, 276, 69, 92, 276, 276, 92, 2024, 506, 2024, 1012, 2024, 253, 2024, 2024, 184, 92, 10626, 10626, 3542, 1518, 759, 506, 1518, 966, 322, 42504, 7084, 6072, 759, 2024
Offset: 0

Views

Author

Jon Perry, Jan 04 2003

Keywords

Links

Crossrefs

Cf. A010940, A079342.

Programs

  • PARI
    y=(1-x)^24; for (m=0,12, for (n=m,12,print1(gcd(polcoeff(y,m),polcoeff(y,n))",")))

Extensions

Base sequence name changed by Michel Marcus and Georg Fischer, Aug 24 2020

A152957 Numbers n such that LS(n) divides n, where LS is the "Look and Say" function (A045918).

Original entry on oeis.org

22, 777, 4444, 200000, 333000, 333333, 555555, 660000, 666666, 700000, 4444400, 7700000, 22333000, 44445555, 55556666, 77700000, 88888888, 200000000, 777770000, 999900000, 999999000, 2222220000, 22222200000, 22333338888, 28800000000, 35555555505, 111111000000, 111777000000
Offset: 1

Views

Author

David Wasserman, Dec 15 2008

Keywords

Examples

			777 is a member because it is three 7's, so LS(777) = 37 which divides 777.

Crossrefs

Cf. A045918, A079342.

Extensions

Definition corrected and more terms from Sean A. Irvine, Mar 17 2011

A110744 Integers k such that k divides LS(k) or LS(k) divides k, where LS is the "Look and Say" function (A045918).

Original entry on oeis.org

1, 2, 5, 10, 22, 32, 62, 91, 183, 188, 190, 196, 258, 276, 330, 671, 710, 777, 1130, 1210, 1570, 2644, 2998, 3292, 4214, 4444, 17055, 20035, 53015, 70315, 101010, 108947, 199245, 200000, 233606, 309665, 323232, 333000, 333333, 356421, 483405, 555555, 626262, 660000, 666666, 700000
Offset: 1

Views

Author

Amarnath Murthy, Aug 10 2005

Keywords

Comments

Union of A079342 and A152957.

Examples

			5 is a term because it is one 5, so LS(5) = 15, a multiple of 5.
4444 is a term because it is four 4's, so LS(4444) = 44, which divides 4444.

Crossrefs

Cf. A045918, A079342, A152957.

Extensions

Corrected and extended by David Wasserman, Dec 15 2008

A247148 Primes p that divide LS(p), where LS is the "Look and Say" function (A045918).

Original entry on oeis.org

2, 5, 108947, 4940867
Offset: 1

Views

Author

G. L. Honaker, Jr., Nov 20 2014

Keywords

Comments

a(5) > 4*10^12. - Tyler Busby, Feb 02 2023

Examples

			a(2)=5, because 5 is prime and divides LS(5) or 15.

Links

Crossrefs

Cf. A000040, A045918, A079342.

Extensions

a(4) from Alois P. Heinz, Nov 20 2014
Showing 1-6 of 6 results.

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

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