id:A119238 - OEIS Search Results

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A119238

Numbers n such that the decimal representation of n is contained as substring in that of the n-th triangular number.

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1, 5, 19, 25, 199, 625, 1999, 2102, 5582, 9376, 9909, 10100, 16833, 19999, 41012, 55741, 74491, 83885, 88102, 90625, 151774, 199999, 201002, 558257, 626522, 740312, 798097, 810062, 890625, 1001000, 1030563, 1668333, 1999999, 2646751 (list; graph; listen)

	OFFSET	`1,2`
	MATHEMATICA	`Select[Range@100000, ({}!=StringPosition[ToString[ #(#+1)/2], ToString@# ]) &]`
	CROSSREFS	`Cf. A046831.` `Sequence in context: A022143 A004623 A018475 this_sequence A061388 A106072 A106062` `Adjacent sequences: A119235 A119236 A119237 this_sequence A119239 A119240 A119241`
	KEYWORD	`base,nonn`
	AUTHOR	`Giovanni Resta (g.resta(AT)iit.cnr.it), May 10 2006`

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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.

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