A116205 - OEIS

A116205

Numbers k such that k concatenated with k+7 gives the product of two numbers which differ by 3.

1, 81, 1353, 3997, 7723, 23761, 26271, 76771, 1415683, 3890571, 8495497, 1066870443, 1239366513, 4198438981, 4534273891, 6502317141, 6918679731, 2199164200036329043, 2820114781174460091, 5500888421709400741

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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

Table of n, a(n) for n=1..20.

CROSSREFS

Cf. A116179, A116172, A115429, A116173, A116193, A116336.

Cf. A116132, A116099, A116139, A116152, A116269, A116348.

Sequence in context: A059977 A231912 A382388 * A237455 A253488 A236738

Adjacent sequences: A116202 A116203 A116204 * A116206 A116207 A116208

KEYWORD

nonn,base

AUTHOR

Giovanni Resta, Feb 06 2006

EXTENSIONS

Edited by N. J. A. Sloane, Apr 13 2007

STATUS

approved