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A116044 n+phi(n)+phi(phi(n)) is a palindrome. 1
1, 2, 3, 4, 5, 6, 14, 23, 28, 45, 51, 55, 56, 63, 75, 79, 85, 95, 136, 138, 146, 161, 168, 169, 186, 189, 195, 201, 227, 231, 241, 247, 272, 274, 275, 276, 292, 297, 306, 322, 323, 336, 389, 398, 418, 423, 430, 444, 473, 504, 514, 543, 552, 555, 567, 574, 582 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Robert Israel, Table of n, a(n) for n = 1..2000

EXAMPLE

227+phi(227)+phi(phi(227)) = 565.

MAPLE

filter:= proc(n) local t, x, L;

uses numtheory;

  t:= phi(n);

  x:= n + t + phi(t);

L:= convert(x, base, 10);

andmap(i -> L[i]=L[-i], [$1..nops(L)/2]);

end proc:

select(filter, [$1..1000]); # Robert Israel, Sep 03 2020

CROSSREFS

Cf. A115905.

Sequence in context: A249102 A250047 A084830 * A116027 A085157 A065637

Adjacent sequences:  A116041 A116042 A116043 * A116045 A116046 A116047

KEYWORD

nonn,base

AUTHOR

Giovanni Resta, Feb 13 2006

STATUS

approved

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Last modified May 26 17:16 EDT 2022. Contains 354092 sequences. (Running on oeis4.)