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 A104611 Write the natural numbers in base 7 in a triangle with k digits in the k-th row, as shown below. Sequence gives the leading diagonal. 15
 1, 3, 6, 1, 1, 2, 3, 0, 3, 4, 1, 0, 1, 4, 2, 1, 6, 5, 1, 4, 4, 2, 5, 6, 2, 2, 4, 3, 2, 5, 3, 5, 2, 4, 4, 2, 5, 6, 5, 5, 4, 4, 6, 0, 2, 1, 3, 1, 1, 3, 1, 2, 2, 1, 1, 1, 1, 5, 4, 4, 4, 1, 1, 3, 1, 2, 6, 0, 2, 2, 3, 0, 2, 1, 2, 2, 2, 2, 0, 6, 2, 2, 5, 6, 4, 3, 6, 0, 3, 6, 2, 2, 2, 3, 0, 3, 3, 5, 6, 6, 2, 4, 3, 1, 4 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS 1 23 456 1011 12131 415162... LINKS MATHEMATICA t = Flatten[ IntegerDigits[ Range[1500], 7]]; t[[Table[n(n + 1)/2, {n, 105}]]] CROSSREFS Cf. A104606, A104607, A104608, A104609, A104610, A104612, A104613, A091425, A104614, A104615, A104616, A104617, A104618, A104619, A104620. Sequence in context: A142464 A177022 A008953 * A076790 A095693 A032660 Adjacent sequences:  A104608 A104609 A104610 * A104612 A104613 A104614 KEYWORD base,nonn AUTHOR Robert G. Wilson v, Mar 16 2005 STATUS approved

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Last modified February 23 02:29 EST 2019. Contains 320411 sequences. (Running on oeis4.)