OFFSET
0,2
LINKS
Eric Weisstein's World of Mathematics, Sierpiński Number of the First Kind
FORMULA
a(n) = ceiling(2^(n+2^n)*log_10(2)).
MATHEMATICA
a[k_] := Ceiling[2^(k+2^k) Log[2]/Log[10]];
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Eric W. Weisstein, Nov 16 2003
STATUS
approved