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A308983 Numbers n such that A308803(2n+1) = (2*10^n-1)(5*10^n+1). 1
4, 15, 18, 20, 23, 29, 33, 34, 35, 36, 38, 39, 43, 48, 49, 50, 54, 56, 60, 62, 63, 66, 68, 69, 74, 75, 77, 78, 81, 83, 84, 86, 88, 89 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

A308803(2n+1) >= (2*10^n-1)(5*10^n+1) for all n. This sequence lists the values of n where this lower bound is attained.

LINKS

Table of n, a(n) for n=1..34.

CROSSREFS

Cf. A308803

Sequence in context: A065159 A240265 A051956 * A032826 A190709 A166732

Adjacent sequences: A308980 A308981 A308982 * A308984 A308985 A308986

KEYWORD

nonn,base,more

AUTHOR

Chai Wah Wu, Sep 30 2019

EXTENSIONS

a(14)-a(34) from Chai Wah Wu, Oct 03 2019

STATUS

approved

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Last modified February 7 06:02 EST 2023. Contains 360112 sequences. (Running on oeis4.)