id:A164794 - OEIS Search Results

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a(n) = smallest number which has in its English name the letter "f" in the n-th position, -1 if such number no exist

+0
1

4, -1, 15, -1, -1, 44, 24, 74, -1, -1, 104, 404, 115, 415, 315, 144, 124, 174, 324, 374 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`a(1)=Four, a(3)=fiFteen`
	CROSSREFS	`Sequence in context: A096644 A145829 A016115 this_sequence A107873 A156290 A080419` `Adjacent sequences: A164791 A164792 A164793 this_sequence A164795 A164796 A164797`
	KEYWORD	`word,sign`
	AUTHOR	`Claudio L Meller (claudiomeller(AT)gmail.com), Aug 26 2009`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.