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A177372
Fibonacci numbers whose decimal expansion does not contain any digit 7
2
1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 610, 2584, 4181, 10946, 46368, 121393, 196418, 514229, 832040, 1346269, 14930352, 39088169, 63245986, 102334155, 165580141, 1836311903, 12586269025, 32951280099, 139583862445, 365435296162
OFFSET
1,3
COMMENTS
Probability that Fib(n) contains no digit 7 goes to zero as n grows to infinity. I suppose that the maximum number is Fib(224) having 47 digits.
EXAMPLE
a(14)=610 since it is the 14th Fibonacci containing no 7's.
MATHEMATICA
Select[Fibonacci[Range[100]], DigitCount[#, 10, 7]==0&] (* Harvey P. Dale, Dec 13 2014 *)
KEYWORD
nonn,base
AUTHOR
Carmine Suriano, May 07 2010
STATUS
approved