A263959 Number of decimal digits in A069151(n).

1, 2, 4, 355, 499, 1171, 1543, 5719

Offset

1,2

Comments

Subset of A227530 (Copeland-Erdős constant primes) corresponding to concatenation of a full (non-truncated) final prime.

a(9) > 459970. - Eric W. Weisstein (according to Mark Rodenkirch as of Nov 21 2015)

Links

Table of n, a(n) for n=1..8.

Eric Weisstein's World of Mathematics, Consecutive Number Sequences

Eric Weisstein's World of Mathematics, Integer Sequence Primes

Eric Weisstein's World of Mathematics, Smarandache-Wellin Prime

Mathematica

Cases[FromDigits /@ Rest[FoldList[Join, {}, IntegerDigits[Prime[Range[10^3]]]]], p_?PrimeQ :> IntegerLength[p]]

Prog

(PARI) p=""; for(n=1, 1e4, p=concat(p, prime(n)); if(ispseudoprime( eval(p)), print1(#Str(p)", "))) \\ Altug Alkan, Oct 30 2015

Crossrefs

Cf. A019518, A046035, A069151.

Cf. A227529 (Copeland-Erdős constant primes).

Cf. A227530 (decimal digits in n-th Copeland-Erdős constant prime).

Sequence in context: A012618 A012557 A012562 * A216024 A247220 A012753

Adjacent sequences: A263956 A263957 A263958 * A263960 A263961 A263962

Keyword

nonn,base,more

Author

Eric W. Weisstein, Oct 30 2015

Status

approved