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

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A089952 n+1 and phi(n)+1 are both perfect squares. 0
15, 24, 35, 143, 168, 323, 575, 675, 728, 899, 1599, 1763, 2600, 3599, 3720, 5183, 5775, 10403, 11663, 19043, 19320, 21315, 22499, 29928, 32399, 36863, 38024, 39203, 47523, 51528, 51983, 54288, 57599, 67080, 72899, 79523, 93635, 97343 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

MATHEMATICA

Select[Range[10^5], IntegerQ[Sqrt[ # + 1]] && IntegerQ[Sqrt[EulerPhi[ # ] + 1]] &]

CROSSREFS

Sequence in context: A173035 A081829 A079721 * A162964 A067343 A154150

Adjacent sequences:  A089949 A089950 A089951 * A089953 A089954 A089955

KEYWORD

nonn

AUTHOR

Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Jan 17 2004

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 14 11:36 EST 2012. Contains 205623 sequences.