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A077651 Initial digit of phi(n), where phi is Euler totient function, A000010. 2
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; text; internal format)
OFFSET

1,3

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..10000

FORMULA

a(n) = A000030(A000010(n)).

MATHEMATICA

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

PROG

(PARI) A077651(n) = (digits(eulerphi(n))[1]); \\ Antti Karttunen, Dec 04 2017

CROSSREFS

Cf. A000030, A000010, A004085.

Sequence in context: A278229 A233027 A262550 * A004085 A293482 A086296

Adjacent sequences:  A077648 A077649 A077650 * A077652 A077653 A077654

KEYWORD

base,nonn

AUTHOR

Labos Elemer, Nov 19 2002

STATUS

approved

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Last modified September 20 03:32 EDT 2019. Contains 327209 sequences. (Running on oeis4.)