The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

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