1,2

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

Count odd composites 1 mod 4 less than 10^n

For n>1, a(n) = 25*10^(n-2) - 1 - A091098(n). - Max Alekseyev, May 30 2007

Below 10^2 there are 13 odd composites so a(2)=13

Cf. A093152 A093153 A091295 A091098 A091099.

Sequence in context: A188749 A045589 A245228 * A188869 A014956 A171287

Adjacent sequences: A093148 A093149 A093150 * A093152 A093153 A093154

nonn

Enoch Haga, Mar 24 2004

More terms from Max Alekseyev, May 30 2007

Extended by Max Alekseyev, Oct 13 2009

approved