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A116205 Numbers k such that k concatenated with k+7 gives the product of two numbers which differ by 3. 11
1, 81, 1353, 3997, 7723, 23761, 26271, 76771, 1415683, 3890571, 8495497, 1066870443, 1239366513, 4198438981, 4534273891, 6502317141, 6918679731, 2199164200036329043, 2820114781174460091, 5500888421709400741 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Also numbers k such that k concatenated with k+9 gives the product of two numbers which differ by 1.
Also numbers k such that k concatenated with k-3 gives the product of two numbers which differ by 7.
LINKS
CROSSREFS
Sequence in context: A224014 A059977 A231912 * A237455 A253488 A236738
KEYWORD
nonn,base
AUTHOR
Giovanni Resta, Feb 06 2006
EXTENSIONS
Edited by N. J. A. Sloane, Apr 13 2007
STATUS
approved

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Last modified May 27 02:27 EDT 2024. Contains 372847 sequences. (Running on oeis4.)