A154779 Number of terms with n digits in A154780.

1, 1, 2, 2, 4, 6, 12, 17, 34, 55, 98, 161, 288, 448, 811, 1265, 2145, 3425, 5860, 9305, 15384, 24690, 40445, 64715

Offset

1,3

Comments

Does the ratio of consecutive terms, a(n+1)/a(n), tend to a finite limit?

Links

Table of n, a(n) for n=1..24.

Prog

(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))

Crossrefs

Sequence in context: A267610 A336940 A291365 * A332983 A010101 A274942

Adjacent sequences: A154776 A154777 A154778 * A154780 A154781 A154782

Keyword

nonn,base

Author

M. F. Hasler, Jan 24 2009

Status

approved