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 A085597 Numbers k such that k and k^3 use only odd digits. 2
 1, 11, 15, 33, 39, 71, 91, 173, 175, 179, 335, 3337, 5597, 7353 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Numbers k such that k^3 uses only odd digits are in A030099. No other terms below 10^16. The sequence is likely finite. - Max Alekseyev, Oct 17 2017 a(15) > 10^19, if it exists. - Giovanni Resta, Mar 13 2020 LINKS EXAMPLE 15 is a term because both 15 and 15^3=3375 use only odd digits. MATHEMATICA Select[Range[10000], And@@OddQ[Join[IntegerDigits[#], IntegerDigits[ #^3]]]&] (* Harvey P. Dale, May 15 2012 *) PROG (PARI) isoddd(n) = #select(x->((x%2) == 0), digits(n)) == 0; isok(n) = isoddd(n) && isoddd(n^3); \\ Michel Marcus, Dec 03 2016 CROSSREFS Cf. A030099. Sequence in context: A009433 A275242 A030099 * A316643 A097512 A032490 Adjacent sequences: A085594 A085595 A085596 * A085598 A085599 A085600 KEYWORD nonn,base,more AUTHOR Zak Seidov, Jul 06 2003 STATUS approved

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Last modified January 27 17:42 EST 2023. Contains 359845 sequences. (Running on oeis4.)