cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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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.

Original entry on oeis.org

2, 5, 89, 514229, 433494437, 2971215073, 3061719992484545030554313848083717208111285432353738497131674799321571238149015933442805665949
Offset: 1

Views

Author

Harvey P. Dale, Sep 14 2018

Keywords

Comments

a(8) = A000045(104911) has 21925 decimal digits. - Alois P. Heinz, Sep 17 2018

Examples

			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.

Crossrefs

Cf. A000045, A001605, A005478, A007953, A075737, A319393. Subsequence of A111331.

Programs

  • Mathematica
    Select[With[{nn=2000},Pick[Fibonacci[Range[nn]],PrimeQ[Range[nn]]]],PrimeQ[#] && PrimeQ[ Total[ IntegerDigits[#]]]&]

Formula

a(n) = A000045(A319393(n)).
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Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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