The On-Line Encyclopedia of Integer Sequences (OEIS)

A053013 revision #7

A053013

Positions in decimal expansion of Pi where next prime begins.

1, 2, 7, 8, 11, 12, 14, 15, 19, 3076, 3077, 3078, 3081, 3082, 3083, 3831, 3833, 3835, 3836, 3838, 3921, 3926, 3927, 3929, 4000, 4010, 4011, 4012, 4014, 4016, 4018, 4019, 4020, 4023, 4024, 4038, 4040, 4045, 4096, 4097, 4103, 4104, 4110, 4113, 4115, 4124

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OFFSET

1,2

COMMENTS

This sequence refers to a variant of A047777 in which one does not require that all primes are distinct. See A229181 for first differences of this sequence. - M. F. Hasler, Sep 15 2013

LINKS

Table of n, a(n) for n=1..46.

FORMULA

Partial sums of A229181: a(n)=sum_{k=1...n} A229181(k). - M. F. Hasler, Sep 15 2013

MATHEMATICA

A229181 = {1}; digits = Join[{{1}}, RealDigits[Pi, 10, 5000] // First // Rest]; digits //. {a:({_Integer..}..), b__Integer /; PrimeQ[FromDigits[{b}]], c___Integer} :> (Print[lg = {b} // Length]; AppendTo[A229181, lg]; {{1}, c}) ; Join[{1}, Accumulate[A229181] + 1] (* Jean-François Alcover, Oct 17 2013 *)

CROSSREFS

Sequence in context: A005538 A329648 A206331 * A070044 A129850 A037073

Adjacent sequences: A053010 A053011 A053012 * A053014 A053015 A053016

KEYWORD

nonn,base

AUTHOR

Mark R. Diamond (markd(AT)psy.uwa.edu.au), Feb 22, 2000

STATUS

proposed