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A116209 Numbers k such that k concatenated with k+7 gives the product of two numbers which differ by 7. 5
1, 13, 41, 653, 2287, 2723, 5491, 23240971, 26823191, 60249661, 1841968537, 2009317771, 3044234903, 3258336353, 8166731261, 9481619237, 1281071245505271100098621541, 1551605670846640136726379653 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..18.

CROSSREFS

Cf. A116153, A116147, A116208, A116210, A116215, A116340.

Sequence in context: A332255 A201121 A116153 * A002673 A081301 A159527

Adjacent sequences:  A116206 A116207 A116208 * A116210 A116211 A116212

KEYWORD

nonn,base

AUTHOR

Giovanni Resta, Feb 06 2006

STATUS

approved

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Last modified September 28 14:44 EDT 2022. Contains 357073 sequences. (Running on oeis4.)