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 A115656 Both n and the reverse of n are powerful(1) numbers (A001694). 5
 1, 4, 8, 9, 27, 72, 100, 121, 144, 169, 343, 400, 441, 484, 576, 675, 676, 800, 900, 961, 1000, 1089, 1331, 1800, 2700, 3087, 4000, 7200, 7803, 8000, 9000, 9801, 10000, 10201, 10404, 10609, 12100, 12321, 12544, 12769, 14400, 14641, 14884 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Charles R Greathouse IV, Table of n, a(n) for n = 1..6228 EXAMPLE 9801=3^4*11^2 and 1089=3^2*11^2. PROG (PARI) is(n)=ispowerful(n) && ispowerful(subst(Polrev(digits(n)), 'x, 10)) \\ Charles R Greathouse IV, Sep 16 2014 (PARI) has(n)=ispowerful(subst(Polrev(digits(n)), 'x, 10)) list(lim)=my(v=List(), t, t2); for(m=1, lim^(1/3), t=m^3; for(n=1, sqrtint(lim\t), if(has(t2=t*n^2), listput(v, t2)))); Set(v) \\ Charles R Greathouse IV, Sep 16 2014 CROSSREFS Cf. A001694, A115655, A085751. Sequence in context: A115697 A075783 A098121 * A076705 A306916 A355063 Adjacent sequences: A115653 A115654 A115655 * A115657 A115658 A115659 KEYWORD base,nonn AUTHOR Giovanni Resta, Jan 28 2006 STATUS approved

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Last modified October 4 10:09 EDT 2023. Contains 365874 sequences. (Running on oeis4.)