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

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A082849 Product of cototient values of consecutive integers. 0
0, 1, 2, 2, 4, 4, 4, 12, 18, 6, 8, 8, 8, 56, 56, 8, 12, 12, 12, 108, 108, 12, 16, 80, 70, 126, 144, 16, 22, 22, 16, 208, 234, 198, 264, 24, 20, 300, 360, 24, 30, 30, 24, 504, 504, 24, 32, 224, 210, 570, 532, 28, 36, 540, 480, 672, 630, 30, 44, 44, 32, 864, 864, 544, 782 (list; graph; refs; listen; history; internal format)
OFFSET

1,3

FORMULA

a(n)=A051953[n].A051952[n+1]

MATHEMATICA

f[x_] := x-EulerPhi[x] tpr=Table[f[w+1]*f[w], {w, 1, 128}]

CROSSREFS

Cf. A051953, A083538-A083555.

Sequence in context: A129163 A083549 A083548 * A156130 A123756 A116648

Adjacent sequences:  A082846 A082847 A082848 * A082850 A082851 A082852

KEYWORD

nonn

AUTHOR

Labos E. (labos(AT)ana.sote.hu), May 22 2003

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 16 05:39 EST 2012. Contains 205860 sequences.