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A096504 Euler-phi applied to A096503 results in these decimal repdigits. 3
1, 1, 2, 2, 4, 2, 6, 4, 6, 4, 4, 6, 8, 8, 6, 8, 22, 8, 8, 22, 66, 44, 88, 44, 88, 66, 44, 88, 88, 222, 88, 88, 222, 444, 444, 888, 888, 444, 888, 888, 888, 888, 888, 888, 444444, 666666, 444444, 888888, 888888, 666666, 888888, 888888, 888888, 888888, 888888 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..55.

EXAMPLE

n=88888892, A000010(n)=44444444;

Regular solutions: if x=repdigit+1 is prime, then phi(x)=repdigit.

PROG

(PARI) lista(nn) = {for (n= 1, nn, phin = eulerphi(n); d = digits(e=eulerphi(n)); if (vecmin(d) == vecmax(d), print1(e, ", ")); ); } \\ Michel Marcus, Sep 07 2014

CROSSREFS

Sequence in context: A004085 A293482 A086296 * A277906 A290077 A277030

Adjacent sequences:  A096501 A096502 A096503 * A096505 A096506 A096507

KEYWORD

base,nonn

AUTHOR

Labos Elemer, Jul 12 2004

STATUS

approved

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Last modified September 20 21:19 EDT 2019. Contains 327247 sequences. (Running on oeis4.)