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.

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A331526 a(n) is the least positive k such that A100273(n) - k^3 is a fifth power.

Original entry on oeis.org

1, 3, 5, 2, 4, 9, 3, 7, 9, 13, 15, 8, 16, 14, 19, 5, 20, 21, 13, 22, 17, 25, 4, 10, 27, 16, 18, 29, 24, 33, 31, 35, 4, 39, 8, 39, 36, 20, 22, 41, 42, 28, 44, 46, 7, 13, 19, 47, 48, 38, 46, 49, 40, 50, 48, 33, 39, 2, 6, 8, 12, 56, 26, 52, 62, 63, 58, 23, 64, 31
Offset: 1

Views

Author

Rémy Sigrist, Jan 19 2020

Keywords

Examples

			The first terms, alongside A100273(n), are:
  n   a(n)  A100273(n)
  --  ----  -----------------
   1     1     2 =  1^3 + 1^5
   2     3    59 =  3^3 + 2^5
   3     5   157 =  5^3 + 2^5
   4     2   251 =  2^3 + 3^5
   5     4   307 =  4^3 + 3^5
   6     9   761 =  9^3 + 2^5
   7     3  1051 =  3^3 + 4^5
   8     7  1367 =  7^3 + 4^5
   9     9  1753 =  9^3 + 4^5
  10    13  3221 = 13^3 + 4^5
		

Crossrefs

See A331435 for similar sequences.

Programs

  • PARI
    See Links section.

A100293 Numbers of the form a^5 + b^3 with a,b>0.

Original entry on oeis.org

2, 9, 28, 33, 40, 59, 65, 96, 126, 157, 217, 244, 248, 251, 270, 307, 344, 368, 375, 459, 513, 544, 586, 730, 755, 761, 972, 1001, 1025, 1032, 1051, 1088, 1149, 1240, 1243, 1332, 1363, 1367, 1536, 1574, 1729, 1753, 1760, 1971, 2024, 2198, 2229, 2355, 2440
Offset: 1

Views

Author

T. D. Noe, Nov 18 2004

Keywords

Crossrefs

Cf. A100273 (primes of the form a^5 + b^3).

Programs

  • Mathematica
    lst={}; Do[p=a^5+b^3; If[p<5000, AppendTo[lst, p]], {a, 64}, {b, 1024}]; Union[lst]
  • PARI
    is(n)=for(y=1,sqrtnint(n-1,5), if(ispower(n-y^5,3),return(1))); 0 \\ Charles R Greathouse IV, Jun 06 2016
Showing 1-2 of 2 results.