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 1-4 of 4 results.

A037160 Squares in A037159.

Original entry on oeis.org

21609, 27889, 54289, 1461681, 6610041, 8037225, 25250625, 39778249, 50908225, 60637369, 171321921, 207504025, 218123361, 307265841, 315808441, 380367009, 435598641, 437353569, 528126361, 561073969, 581340321, 708890625, 877285161
Offset: 1

Views

Author

Naohiro Nomoto

Keywords

Crossrefs

Cf. A037159.

Programs

Extensions

Better description from Jud McCranie, Dec 24 2000
More terms from Sam Handler (sam_5_5_5_0(AT)yahoo.com), Aug 09 2006

A058541 Trajectory of 1 under map that sends x to 3x - sigma(x).

Original entry on oeis.org

1, 2, 3, 5, 9, 14, 18, 15, 21, 31, 61, 121, 230, 258, 246, 234, 156, 76, 88, 84, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28
Offset: 0

Views

Author

N. J. A. Sloane, Jud McCranie, Dec 24 2000

Keywords

Crossrefs

Cf. A037159, A058542, A058545.

Programs

  • Mathematica
    NestList[3#-DivisorSigma[1,#]&,1,70] (* Harvey P. Dale, Jul 23 2012 *)

A058542 Trajectory of 16 under map that sends x to 3x - sigma(x).

Original entry on oeis.org

16, 17, 33, 51, 81, 122, 180, -6, -30, -162, -849, -3683, -14889, -67387, -270481, -1083495, -5351733, -23785493, -95779647, -425687333, -1702749333, -7385743647, -33685755741, -156526119063, -703401325293, -3048080581927, -12307998348021, -53348118829343
Offset: 0

Views

Author

N. J. A. Sloane, Dec 24 2000

Keywords

Crossrefs

Cf. A037159, A058541, A058545.

Programs

  • Mathematica
    NestList[3#-DivisorSigma[1,#]&,16,30] (* Harvey P. Dale, Jun 01 2016 *)

A058545 Trajectory of 23 under map that sends x to 3x - sigma(x), where sigma(x) is the sum of the divisors of x.

Original entry on oeis.org

23, 45, 57, 91, 161, 291, 481, 911, 1821, 3031, 5621, 9759, 16261, 29199, 48661, 97321, 180731, 361461, 595359, 914661, 1302543, 1810989, 2732295, 3594645, 4393215, 5513805, 5482215, 6700245, 8913663, 12588669, 19116087, 31171125
Offset: 0

Views

Author

N. J. A. Sloane, Dec 24 2000

Keywords

Crossrefs

Cf. A037159, A058541, A058542.
Showing 1-4 of 4 results.

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

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