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 A241072 Valid groups of final digits a square number made entirely of the digits 6, 7 and 8 can have. 0
 6, 76, 676, 776, 876, 6676, 7776, 7876, 8676, 67776, 67876, 68676, 76676, 77776, 87776, 87876, 88676, 667776, 667876, 668676, 676676, 677776, 687876, 688676, 767876, 768676, 776676, 787776, 787876, 788676, 867776, 867876, 868676, 876676, 877776, 887876, 888676 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Table of n, a(n) for n=1..37. Patrick De Geest, Squares made of 3 distinct digits EXAMPLE 66 is not in this sequence because a square number cannot end in 66; a square ending in 6 must have 1, 3, 5, 7, or 9 as its next-to-last digit. MATHEMATICA eLim = 6; nn = 10^eLim; t = {}; s1 = Select[Range[nn]^2, Mod[#, 10] == 6 &]; Do[s2 = Select[s1, Complement[Union[IntegerDigits[Mod[#, 10^e]]], {6, 7, 8}] == {} &]; u = Union[Mod[s2, 10^e]]; t = Union[t, u], {e, 2, eLim}]; t (* T. D. Noe, Apr 15 2014 *) CROSSREFS Sequence in context: A229571 A016090 A181343 * A137132 A053337 A199026 Adjacent sequences: A241069 A241070 A241071 * A241073 A241074 A241075 KEYWORD nonn,base AUTHOR J. Lowell, Apr 15 2014 EXTENSIONS Extended by T. D. Noe, Apr 15 2014 STATUS approved

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Last modified September 9 21:06 EDT 2024. Contains 375765 sequences. (Running on oeis4.)