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 A027675 When squared gives number composed of digits {1,4,9}. 4
 1, 2, 3, 7, 12, 21, 38, 107, 212, 31488, 70107, 387288, 95610729, 446653271, 3148717107, 21081079479, 648070211589107021 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS If a number has a least significant digit of 0, 4, 5 or 6, it can't be in this sequence. - Alonso del Arte, Jun 11 2016 LINKS Chris, Three Digits Solution, June 29, 2005. Patrick De Geest, Palindromic Squares A. Ottens, The arithmetic-digits-squares-three.digits problem [broken link]. Eric Weisstein's World of Mathematics, Square Number. EXAMPLE Since 107^2 = 11449, 107 is in the sequence. As 108^2 = 11664 has two 6's, 108 is not in the sequence. MATHEMATICA Select[Range[100], Complement[IntegerDigits[#^2], {1, 4, 9}] == {} &] (* Alonso del Arte, Jun 11 2016 *) CROSSREFS Cf. A006716. Sequence in context: A222196 A184696 A298341 * A298353 A054176 A289977 Adjacent sequences:  A027672 A027673 A027674 * A027676 A027677 A027678 KEYWORD nonn,base,more AUTHOR STATUS approved

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Last modified May 12 17:10 EDT 2021. Contains 343825 sequences. (Running on oeis4.)