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

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A077651 Initial digit of phi[n]. 0
1, 1, 2, 2, 4, 2, 6, 4, 6, 4, 1, 4, 1, 6, 8, 8, 1, 6, 1, 8, 1, 1, 2, 8, 2, 1, 1, 1, 2, 8, 3, 1, 2, 1, 2, 1, 3, 1, 2, 1, 4, 1, 4, 2, 2, 2, 4, 1, 4, 2, 3, 2, 5, 1, 4, 2, 3, 2, 5, 1, 6, 3, 3, 3, 4, 2, 6, 3, 4, 2, 7, 2, 7, 3, 4, 3, 6, 2, 7, 3, 5, 4, 8, 2, 6, 4, 5, 4, 8, 2, 7, 4, 6, 4, 7, 3, 9, 4, 6, 4, 1, 3, 1, 4, 4 (list; graph; refs; listen; history; internal format)
OFFSET

1,3

FORMULA

a[n]=A000030[A000010(n)]

MATHEMATICA

Table[First[IntegerDigits[EulerPhi[w]]], {w, 1, 128}]

CROSSREFS

Cf. A000030, A000010.

Sequence in context: A082175 A129292 A126606 * A004085 A086296 A096504

Adjacent sequences:  A077648 A077649 A077650 * A077652 A077653 A077654

KEYWORD

base,nonn

AUTHOR

Labos E. (labos(AT)ana.sote.hu), Nov 19 2002

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 17 23:49 EST 2012. Contains 206085 sequences.