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 A153025 Numbers n with property that n and n^2 use only prime digits. 2
 5, 235, 72335 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Probably there are no other terms. No other terms up to 10^40. Intersection of A046034 and A275971. - M. F. Hasler, Sep 16 2016 LINKS Table of n, a(n) for n=1..3. EXAMPLE The squares of 5, 235, 72335 are 25, 55225, 5232352225. MATHEMATICA Flatten[Table[Select[FromDigits/@Tuples[{2, 3, 5, 7}, n], AllTrue[ IntegerDigits[ #^2], PrimeQ]&], {n, 5}]] (* The program uses the AllTrue function from Mathematica version 10 *) (* Harvey P. Dale, Oct 16 2014 *) CROSSREFS Cf. A046034, A275971. Sequence in context: A157710 A265957 A137085 * A140518 A269551 A200962 Adjacent sequences: A153022 A153023 A153024 * A153026 A153027 A153028 KEYWORD nonn,bref,base AUTHOR Zak Seidov, Dec 17 2008 EXTENSIONS Edited by David Wilson and N. J. A. Sloane, Jan 25 2009 STATUS approved

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Last modified June 16 16:46 EDT 2024. Contains 373432 sequences. (Running on oeis4.)