A137494 Fibonacci numbers where no digit is a prime.

0, 1, 1, 8, 89, 144, 610, 4181, 10946, 196418

Offset

1,4

Comments

No more terms up to Fibonacci[10000). [From Harvey P. Dale, Oct 10 2011]

Links

Table of n, a(n) for n=1..10.

Example

196418 is 27th Fibonacci number in which every digit is not a prime.

Maple

ap := proc(n) local i, j, st, st_mn, ans, stevec; ans := [ ]: for i from 0 to n do st := combinat[fibonacci](i): st_mn := convert(convert(st, base, 10), set): stevec := 0: for j from 1 to nops(st_mn) do if (member(op(j, st_mn), {0, 1, 4, 6, 8, 9}) = true) then stevec := stevec + 1: fi od; if (stevec = nops(st_mn)) then ans:=[ op(ans), st ]: fi od; RETURN(ans): end: ap(100000);

Mathematica

Select[Fibonacci[Range[0, 10000]], Union[PrimeQ[IntegerDigits[#]]] =={False}&] (* Harvey P. Dale, Oct 10 2011 *)

Crossrefs

Cf. A000045, A136340.

Sequence in context: A137144 A107677 A084005 * A068498 A061000 A240457

Adjacent sequences: A137491 A137492 A137493 * A137495 A137496 A137497

Keyword

nonn,base

Author

Jani Melik, Apr 22 2008

Status

approved