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A116169 Numbers n such that n concatenated with n+1 gives the product of two numbers which differ by 9. 8
9, 49, 1166975893986638437392162264780939, 1411174268292962563778302427727571, 1860631503683565562655236868895135 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Also numbers n such that n concatenated with n+9 gives the product of two numbers which differ by 7.

LINKS

Table of n, a(n) for n=1..5.

EXAMPLE

49//50 = 66 * 75, where // denotes concatenation.

49//58 = 67 * 74.

CROSSREFS

Cf. A116162, A116168, A116175, A116300.

Cf. A116215, A116174, A116223, A116353.

Sequence in context: A088064 A080812 A276239 * A280549 A084367 A006974

Adjacent sequences:  A116166 A116167 A116168 * A116170 A116171 A116172

KEYWORD

nonn,base

AUTHOR

Giovanni Resta, Feb 06 2006

EXTENSIONS

Edited by N. J. A. Sloane, Apr 15 2007

STATUS

approved

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Last modified March 6 20:37 EST 2021. Contains 341850 sequences. (Running on oeis4.)