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 A053973 Squares composed of digits {6,7,9}. 2
 9, 676, 69696, 97969, 9696996, 9697699776769, 77797697969777769, 776797677679677696, 6776696769676669969, 9767769967769766976, 97667999767779769677969, 7676999976999997667777796, 69997676676669667699797969, 67976976676979976697777676769, 96667776776767999797799699976676 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Author?, Source (txt) Hisanori Mishima, Sporadic tridigital solutions FORMULA a(n) = A053972(n)^2. MATHEMATICA Flatten[Table[Select[FromDigits/@Tuples[{6, 7, 9}, i], IntegerQ[Sqrt[#]]&], {i, 23}]] (* Harvey P. Dale, Dec 07 2014 *) CROSSREFS Cf. A053972. Sequence in context: A054327 A209964 A287937 * A059492 A322488 A109061 Adjacent sequences:  A053970 A053971 A053972 * A053974 A053975 A053976 KEYWORD nonn,base AUTHOR Patrick De Geest, Mar 15 2000. EXTENSIONS More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 14 2005 a(12)-a(15) from Mishima's website, added by Max Alekseyev, Nov 30 2017 STATUS approved

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Last modified September 15 04:09 EDT 2019. Contains 327062 sequences. (Running on oeis4.)