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A068808
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Triangular numbers with strictly increasing sum of digits.
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1
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1, 3, 6, 28, 66, 78, 378, 496, 1596, 5778, 5995, 8778, 47895, 58996, 196878, 468996, 887778, 1788886, 4896885, 5897895, 13999986, 15997996, 38997696, 88877778, 179977878, 189978778, 398988876, 686999778, 1699998895, 5779898886
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OFFSET
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1,2
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LINKS
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Table of n, a(n) for n=1..30.
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MAPLE
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dig := X->convert((convert(X, base, 10)), `+`); T := k->k*(k+1)/2; S := k->seq(dig(T(i)), i=1..k-1); seq(`if`(n>1 and dig(T(n))>max(S(n)), T(n), printf("")), n=1..2000);
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CROSSREFS
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Sequence in context: A075088 A102428 A128056 * A068133 A220823 A024497
Adjacent sequences: A068805 A068806 A068807 * A068809 A068810 A068811
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KEYWORD
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base,easy,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 06 2002
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EXTENSIONS
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More terms from Francois Jooste (phukraut(AT)hotmail.com), Mar 10 2002
More terms from Sascha Kurz, Mar 27 2002
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STATUS
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approved
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