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 A030175 When squared gives number composed of digits {1,2,3}. 9
 1, 11, 111, 36361, 363639, 461761, 3636361, 34815389, 362397739, 176412364139, 57637950363639, 3497458093147239, 56843832676142723489, 557963558954625926861 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Author?, Source(txt) Hisanori Mishima, Sporadic tridigital solutions Eric Weisstein's World of Mathematics, Square Number. FORMULA a(n)^2 = A030174(n). - M. F. Hasler, Nov 16 2017 MATHEMATICA Do[ If[ Union[ Join[{1, 2, 3}, IntegerDigits[n^2] ] ] == {1, 2, 3}, Print[n] ], {n, 0, 10^9}] PROG (PARI) lista(nn) = for(n=1, nn, if(setminus(vecsort(digits(n^2), , 8), [1, 2, 3])==[], print1(n, ", "))) \\ Iain Fox, Nov 16 2017 CROSSREFS Cf. A030174; A000290. Cf. A006716 = A027675^2, A030176 = A030177^2, A058411^2 = A058412, ..., A058473^2 = A058474. Cf. A136808, A136809, ..., A137147: n and n^2 have digits {...}. Cf. A277959^2 = A277946 and A277960^2 = A277947: squares whose largest digit is 2 resp. 3. Sequence in context: A131293 A108047 A144784 * A263805 A058949 A119742 Adjacent sequences:  A030172 A030173 A030174 * A030176 A030177 A030178 KEYWORD nonn,base AUTHOR EXTENSIONS More terms from Patrick De Geest, Mar 01 2000 More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 14 2005 Offset corrected by Iain Fox, Nov 16 2017 STATUS approved

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Last modified December 7 22:29 EST 2019. Contains 329850 sequences. (Running on oeis4.)