%I #5 Jul 14 2012 11:32:22
%S 1,1,2,2,4,6,12,17,34,55,98,161,288,448,811,1265,2145,3425,5860,9305,
%T 15384,24690,40445,64715
%N Number of terms with n digits in A154780.
%C Does the ratio of consecutive terms, a(n+1)/a(n), tend to a finite limit?
%o (PARI) print1("1,",#last=[35]); for(d=3,30, new=[]; forprime( p=0,9, for(k=1,#last, isprime((last[k]^2\10^d+t*last[k]/5)%10) & new=concat(new,last[k]+p*10^(d-1)))); print1(",",#last=new))
%K nonn,base
%O 1,3
%A _M. F. Hasler_, Jan 24 2009