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 20 results. Next

A251538 Numbers n such that A098548(2n+3) > A098548(2n+1) + 6.

Original entry on oeis.org

2, 6, 10, 14, 18, 22, 26, 30, 33, 37, 41, 45, 49, 53, 57, 61, 65, 69, 73, 76, 80, 84, 88, 92, 96, 100, 104, 108, 112, 116, 119, 123, 127, 131, 135, 139, 143, 147, 151, 155, 159, 162, 166, 170, 174, 178, 182, 186, 190, 194, 198, 202, 205, 209, 213, 217, 221, 225
Offset: 1

Views

Author

N. J. A. Sloane, Dec 07 2014

Keywords

Links

Crossrefs

Cf. A098548, A251537, A251539.

Programs

  • Haskell
    a251538 n = a251538_list !! (n-1)
a251538_list = filter (\x -> a098548 (2*x+3) > a098548 (2*x+1) + 6) [1..]
-- Reinhard Zumkeller, Dec 08 2014

Formula

a(i) = (A251537(i)-1)/2 for all i.

A251139 Number of distinct prime factors of A098548(n).

Original entry on oeis.org

0, 1, 1, 1, 1, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 3, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 2, 2, 2, 2, 2, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 2, 2, 2, 2, 2, 2, 2, 3, 2, 3, 1, 2, 2, 2, 2, 2, 2, 2, 3, 2, 2, 3, 2, 2, 2, 2, 2, 2, 2, 3, 2, 3
Offset: 1

Views

Author

Reinhard Zumkeller, Nov 30 2014

Keywords

Comments

a(n) = A001221(A098548(n)).

Links

Crossrefs

Cf. A001221, A098548, A251138, A251141.

Programs

  • Haskell
    a251139 = a001221 . fromIntegral . a098548

A251141 Total number of prime factors of A098548(n).

Original entry on oeis.org

0, 1, 1, 2, 2, 2, 2, 2, 3, 3, 2, 2, 2, 4, 2, 3, 2, 2, 3, 6, 2, 3, 4, 2, 2, 4, 2, 2, 3, 4, 2, 5, 3, 2, 2, 3, 2, 3, 2, 2, 3, 3, 3, 3, 2, 6, 3, 3, 2, 2, 2, 4, 4, 3, 2, 2, 3, 5, 2, 2, 2, 4, 2, 3, 5, 3, 2, 4, 3, 2, 2, 3, 3, 2, 3, 5, 2, 3, 4, 2, 2, 5, 2, 3, 2, 3
Offset: 1

Views

Author

Reinhard Zumkeller, Nov 30 2014

Keywords

Comments

a(n) = A001222(A098548(n)).

Links

Crossrefs

Cf. A001222, A098548, A251140, A251139.

Programs

  • Haskell
    a251141 = a001222 . fromIntegral . a098548

A251535 Bisection A098548(2n+1).

Original entry on oeis.org

1, 3, 9, 21, 27, 33, 39, 51, 57, 63, 69, 81, 87, 93, 99, 111, 117, 123, 129, 141, 147, 153, 159, 171, 177, 183, 189, 201, 207, 213, 219, 237, 243, 249, 261, 267, 273, 279, 291, 297, 303, 309, 321, 327, 333, 339, 351, 357, 363
Offset: 0

Views

Author

N. J. A. Sloane, Dec 07 2014

Keywords

Comments

For a given n>0, imagine a continuously-running wall clock that chimes once every a(n) minutes. Let m equal the number of distinct minute marks the minute hand would point to over the course of time at each chime. This sequence defines the values of a(n) for m=20. An example of this sequence is depicted in Battlestar Galactica Season 1 Episode 1 "33" (from 2004) with a(5)=33. - David Martin, Nov 26 2019

Links

Crossrefs

Cf. A098548, A251536.

Programs

  • Haskell
    a251535 n = a251535_list !! n
a251535_list = fst a098548_bisect
a098548_bisect = cleave a098548_list where
   cleave xs = (evens xs, odds xs) where
      evens [] = []; evens [x] = [x]; evens (x:_:xs) = x : evens xs
      odds [] = []; odds [x] = []; odds (_:x:xs) = x : odds xs
-- Reinhard Zumkeller, Dec 08 2014

A251046 Squarefree part of A098548(n).

Original entry on oeis.org

1, 2, 3, 1, 1, 10, 21, 22, 3, 7, 33, 34, 39, 10, 51, 13, 57, 58, 7, 1, 69, 70, 1, 82, 87, 22, 93, 94, 11, 1, 111, 7, 13, 118, 123, 31, 129, 130, 141, 142, 3, 37, 17, 154, 159, 10, 19, 43, 177, 178, 183, 46, 21, 190, 201, 202, 23, 13, 213, 214, 219, 55, 237
Offset: 1

Views

Author

Reinhard Zumkeller, Nov 30 2014

Keywords

Comments

a(n) = A007913(A098548(n)).

Links

Crossrefs

Cf. A007913, A098548, A251045.

Programs

  • Haskell
    a251046 = a007913 . fromIntegral . a098548

A251090 Squarefree kernel of A098548(n).

Original entry on oeis.org

1, 2, 3, 2, 3, 10, 21, 22, 3, 14, 33, 34, 39, 10, 51, 26, 57, 58, 21, 2, 69, 70, 3, 82, 87, 22, 93, 94, 33, 10, 111, 14, 39, 118, 123, 62, 129, 130, 141, 142, 21, 74, 51, 154, 159, 10, 57, 86, 177, 178, 183, 46, 21, 190, 201, 202, 69, 26, 213, 214, 219, 110
Offset: 1

Views

Author

Reinhard Zumkeller, Nov 30 2014

Keywords

Comments

a(n) = A007947(A098548(n)).

Links

Crossrefs

Cf. A007947, A098548, A251089.

Programs

  • Haskell
    a251090 = a007947 . fromIntegral . a098548

A251104 Largest prime factor of A098548(n).

Original entry on oeis.org

1, 2, 3, 2, 3, 5, 7, 11, 3, 7, 11, 17, 13, 5, 17, 13, 19, 29, 7, 2, 23, 7, 3, 41, 29, 11, 31, 47, 11, 5, 37, 7, 13, 59, 41, 31, 43, 13, 47, 71, 7, 37, 17, 11, 53, 5, 19, 43, 59, 89, 61, 23, 7, 19, 67, 101, 23, 13, 71, 107, 73, 11, 79, 17, 3, 61, 83, 5, 29
Offset: 1

Views

Author

Reinhard Zumkeller, Nov 30 2014

Keywords

Comments

a(n) = A006530(A098548(n)).

Links

Crossrefs

Cf. A006530, A098548, A158478, A251103.

Programs

  • Haskell
    a251104 = a006530 . fromIntegral . a098548

A251536 A098548(2n)/2.

Original entry on oeis.org

1, 2, 5, 11, 14, 17, 20, 26, 29, 32, 35, 41, 44, 47, 50, 56, 59, 62, 65, 71, 74, 77, 80, 86, 89, 92, 95, 101, 104, 107, 110, 119, 122, 125, 131, 134, 137, 140, 146, 149, 152, 155, 161, 164, 167, 170, 176, 179, 182, 185, 191
Offset: 1

Views

Author

N. J. A. Sloane, Dec 07 2014

Keywords

Comments

Equals (A251535(n)+1)/2.

Links

Crossrefs

Cf. A098548, A251535.

Programs

  • Haskell
    a251536 n = a251536_list !! (n-1)
a251536_list = map (flip div 2) $ snd a098548_bisect
-- where a098548_bisect is defined in a251535.
-- Reinhard Zumkeller, Dec 08 2014

A251537 Odd numbers n such that A098548(n+2) > A098548(n) + 6.

Original entry on oeis.org

5, 13, 21, 29, 37, 45, 53, 61, 67, 75, 83, 91, 99, 107, 115, 123, 131, 139, 147, 153, 161, 169, 177, 185, 193, 201, 209, 217, 225, 233, 239, 247, 255, 263, 271, 279, 287, 295, 303, 311, 319, 325, 333, 341, 349, 357, 365, 373
Offset: 1

Views

Author

N. J. A. Sloane, Dec 07 2014

Keywords

Links

Crossrefs

Cf. A098548, A251538, A251539.

Programs

  • Haskell
    a251537 n = a251537_list !! (n-1)
a251537_list = filter (\x -> a098548 (x + 2) > a098548 x + 6) [1, 3 ..]
-- Reinhard Zumkeller, Dec 08 2014

A098549 A098548(A098548(n)).

Original entry on oeis.org

1, 2, 3, 4, 27, 28, 69, 70, 93, 94, 117, 118, 141, 142, 183, 184, 207, 208, 237, 238, 261, 262, 303, 304, 327, 328, 351, 352, 369, 370, 417, 418, 441, 442, 459, 460, 483, 484, 531, 532, 549, 550, 579, 580, 603, 604, 651, 652, 669, 670, 693, 694, 717, 718, 759
Offset: 1

Views

Author

Reinhard Zumkeller, Sep 14 2004

Keywords

Links

Crossrefs

Cf. A098548.

Programs

Showing 1-10 of 20 results. Next

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

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