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A136340 Fibonacci numbers where every digit is a prime. 1
2, 3, 5, 55, 233, 377 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Is this sequence finite?

No more terms < Fibonacci(10^7) ~ 10^2089876.

LINKS

Table of n, a(n) for n=1..6.

Nathan Egge and Aaron Krowne, Planet Math.

EXAMPLE

377 is a Fibonacci number in which every digit is a prime.

PROG

(PARI)

{for (n=2, 10^9,

    F = fibonacci(n);  q = 1;

    while ( F, if ( !isprime(F%10), q=0; break() ); F\=10 );

    if ( q, print1(fibonacci(n), ", ") );

    if ( bitand(n, 4095)==0, print([n]) ); /* document how far search went */

); }

(MAGMA) [ k: n in [1..70000] | forall{ d: d in Intseq(k) | IsPrime(d) } where k is Fibonacci(n) ];

CROSSREFS

Cf. A000045.

Sequence in context: A060085 A114370 A114725 * A029961 A083665 A214752

Adjacent sequences:  A136337 A136338 A136339 * A136341 A136342 A136343

KEYWORD

nonn,base,less

AUTHOR

Parthasarathy Nambi, Apr 12 2008

STATUS

approved

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Last modified June 25 14:30 EDT 2019. Contains 324352 sequences. (Running on oeis4.)