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 A131549 Least power of 3 having exactly n consecutive 4's in its decimal representation. 1
 5, 12, 55, 308, 510, 2340, 7286, 9670, 125406, 222961, 847169, 639226, 6250771, 14929721 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS No more terms < 2*10^7. LINKS EXAMPLE a(3)=55 because 3^55(i.e. 174449211009120179071170507) is the smallest power of 3 to contain a run of 3 consecutive fours in its decimal form. MATHEMATICA a = ""; Do[ a = StringJoin[a, "4"]; b = StringJoin[a, "4"]; k = 1; While[ StringPosition[ ToString[3^k], a] == {} || StringPosition[ ToString[3^k], b] != {}, k++ ]; Print[k], {n, 1, 10} ] CROSSREFS Sequence in context: A189421 A066961 A179994 * A111904 A015784 A129723 Adjacent sequences:  A131546 A131547 A131548 * A131550 A131551 A131552 KEYWORD more,nonn,base AUTHOR Shyam Sunder Gupta (guptass(AT)rediffmail.com), Aug 26 2007 EXTENSIONS a(11)-a(14) from Lars Blomberg, Feb 02 2013 STATUS approved

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