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A099150 Positive integers a such that f(a)+f(a)=concatenation of a and a, where f(k)=k(k+3)/2 (A000096). +0
3
8, 98, 998, 9998, 99998, 999998, 9999998, 99999998 (list; graph; listen)
OFFSET

1,1
CROSSREFS

Cf. A096032, A099148, A099149.

Sequence in context: A116267 A116130 A116287 this_sequence A116229 A159232 A091801

Adjacent sequences: A099147 A099148 A099149 this_sequence A099151 A099152 A099153

KEYWORD

nonn

AUTHOR

John W Layman (layman(AT)math.vt.edu), Sep 30 2004

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Last modified December 5 20:25 EST 2009. Contains 170428 sequences.

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