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 1-3 of 3 results.

A048256 Numbers whose sum of divisors is 6^6 = 46656.

Original entry on oeis.org

17490, 19410, 22578, 24610, 24910, 25466, 25910, 26554, 26818, 27285, 29342, 29733, 29762, 31102, 31535, 32043, 32997, 33985, 35585, 36635, 37985, 39697, 41393, 41837, 42347, 44047, 45637, 45739, 45937, 46117
Offset: 1

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Author

Keywords

Comments

Sequence has A048253(6)=30 terms from A048251(6)=17490 to A048252(6)=46117. - Ray Chandler, Sep 01 2010

Examples

			The divisors of 19410 are 1, 2, 3, 5, 6, 10, 15, 30, 647, 1294, 1941, 3235, 3882, 6470, 9705, and 19410; their sum is 46656, so 19410 is in the sequence.
		

Crossrefs

Programs

  • Mathematica
    Select[Range[6^6], DivisorSigma[1, # ] == 6^6 &] (* Ray Chandler, Sep 01 2010 *)

A048255 Integers whose sum of divisors is 6^5 = 7776.

Original entry on oeis.org

3210, 3498, 3710, 3882, 3910, 4310, 4922, 4982, 5182, 5457, 5885, 6035, 6095, 6307, 6797, 7117, 7327, 7597
Offset: 1

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Author

Keywords

Comments

Sequence has A048253(5)=18 terms from A048251(5)=3210 to A048252(5)=7597. - Ray Chandler

Examples

			Divisors of 7597 are {1,71,107,7597}, whose sum is 7776, so 7597 is in the sequence.
		

Crossrefs

Programs

  • Mathematica
    Select[Range[7600],DivisorSigma[1,#]==7776&] (* Harvey P. Dale, Jun 04 2016 *)
  • PARI
    for(i=1,t=6^5, sigma(i)==t & print1(i",")) \\ M. F. Hasler, Dec 09 2009

Formula

A048255 = { n | A000203(n)=6^5 }. - M. F. Hasler, Dec 09 2009

Extensions

Minor edits, keywords added, and values checked with given PARI code by M. F. Hasler, Dec 09 2009

A048254 Numbers whose sum of divisors is 6^4 = 1296.

Original entry on oeis.org

510, 642, 710, 742, 782, 795, 862, 935, 1177, 1207, 1219
Offset: 1

Views

Author

Keywords

Comments

Sequence has A048253(4)=11 terms from A048251(4)=510 to A048252(4)=1219. - Ray Chandler, Sep 01 2010

Examples

			The divisors of 1219 are 1, 23, 53, and 1219, whose sum is 1296, so 1219 is in the sequence.
		

Crossrefs

Programs

  • Mathematica
    Select[Range[6^4], DivisorSigma[1, # ] == 6^4 &] (* Ray Chandler, Sep 01 2010 *)
Showing 1-3 of 3 results.