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A229181
Number of decimal digits in the variant of A047777(n) (decimal expansion of Pi cut in "prime chunks") without the restriction that all primes must be different.
3
1, 5, 1, 3, 1, 2, 1, 4, 3057, 1, 1, 3, 1, 1, 748, 2, 2, 1, 2, 83, 5, 1, 2, 71, 10, 1, 1, 2, 2, 2, 1, 1, 3, 1, 14, 2, 5, 51, 1, 6, 1, 6, 3, 2, 9, 1, 16, 2, 3, 43, 1, 6, 19, 1, 5, 3, 1999, 1, 1, 2, 22, 1, 3, 1, 2, 2, 1, 2, 2, 5, 1, 1, 1, 1, 4, 1, 1, 3, 7, 5, 1, 6, 4, 3, 1, 10, 7, 1, 2, 11, 2, 5, 1, 13, 1, 20, 16, 1, 9, 16
OFFSET
1,2
COMMENTS
A variant of A121267. First differences of A053013. See these two sequences for further details.
MATHEMATICA
A229181 = {1}; digits = Join[{{1}}, RealDigits[Pi, 10, 10^4] // First // Rest]; digits //. {a:({_Integer..}..), b__Integer /; PrimeQ[FromDigits[{b}]], c___Integer} :> (Print[lg = {b} // Length]; AppendTo[A229181, lg]; {{1}, c}) ; A229181 (* Jean-François Alcover, Oct 17 2013 *)
PROG
(PARI) default(realprecision, 5000); c=Pi/10; u=[]; for(k=1, 9e9, ispseudoprime(c\.1^k) & !print1(k, ", ") & k=0*c=frac(c*10^k))
CROSSREFS
KEYWORD
nonn,base
AUTHOR
M. F. Hasler, Sep 15 2013
EXTENSIONS
More terms from Jean-François Alcover, Oct 17 2013
STATUS
approved