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 A319230 Triple prime Fibonacci numbers: Fibonacci numbers f such that (1) f is prime, (2) f's index is prime, and (3) the sum of f's digits is prime. 1
 2, 5, 89, 514229, 433494437, 2971215073, 3061719992484545030554313848083717208111285432353738497131674799321571238149015933442805665949 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS a(8) = A000045(104911) has 21925 decimal digits. - Alois P. Heinz, Sep 17 2018 LINKS Table of n, a(n) for n=1..7. FORMULA a(n) = A000045(A319393(n)). EXAMPLE 514229 is prime; it is the 29th Fibonacci number and 29 is prime; and the sum of its digits is 23 and 23 is prime. MATHEMATICA Select[With[{nn=2000}, Pick[Fibonacci[Range[nn]], PrimeQ[Range[nn]]]], PrimeQ[#] && PrimeQ[ Total[ IntegerDigits[#]]]&] CROSSREFS Cf. A000045, A001605, A005478, A007953, A075737, A319393. Subsequence of A111331. Sequence in context: A023272 A057978 A093308 * A215797 A262325 A290871 Adjacent sequences: A319227 A319228 A319229 * A319231 A319232 A319233 KEYWORD nonn,base AUTHOR Harvey P. Dale, Sep 14 2018 STATUS approved

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Last modified November 30 23:40 EST 2023. Contains 367464 sequences. (Running on oeis4.)