login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A291216 Padovan numbers that are also squares. 2
0, 1, 4, 9, 16, 49 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Common terms of A000931 and A000290.

Cited from Ian Stewart's article "Tales of a Neglected Number": "Some Padovan numbers, such as 9, 16 and 49, are perfect squares - are there others?"

No other terms < 10^(10^5). - Chai Wah Wu, Aug 31 2017

LINKS

Table of n, a(n) for n=1..6.

Ian Stewart, Tales of a Neglected Number, Mathematical Recreations, Scientific American, June 1996.

Ian Stewart, Die unscheinbare Schwester der goldenen Zahl, Spektrum der Wissenschaft, Dossier 02/2003: Mathematische Unterhaltungen II, 55-57.

CROSSREFS

Cf. A000931, A000290, A100891, A122498, A291673.

Sequence in context: A111378 A106313 A219355 * A074101 A034377 A034378

Adjacent sequences:  A291213 A291214 A291215 * A291217 A291218 A291219

KEYWORD

nonn,more,hard

AUTHOR

Hugo Pfoertner, Aug 31 2017

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified August 18 01:39 EDT 2019. Contains 326059 sequences. (Running on oeis4.)