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A121267
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Number of decimal digits in A047777(n).
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1
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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
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Also the first differences of A053013.
"A new visitor to an old problem! Jens Kruse Andersen confirmed the primality of the 3057 digits Nash prime using PRIMO." - C. Rivera.
Records 1,4,3057,5001,... occur at positions 1,2,9,110,162,...
a(162)>22200.
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LINKS
| Robert G. Wilson v, Table of n, a(n) for n = 1..161
C. Rivera, Prime strings
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MATHEMATICA
| p = RealDigits[Pi, 10, 10000][[1]]; t = {}; Do[k = 1; While[ !PrimeQ[ FromDigits[ Take[p, k]]], k++ ]; p = Drop[p, k]; AppendTo[t, k]; Print@k, {n, 50}]
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CROSSREFS
| Cf. A047777, A053013.
Sequence in context: A011305 A134568 A198798 * A111740 A155059 A206076
Adjacent sequences: A121264 A121265 A121266 * A121268 A121269 A121270
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KEYWORD
| base,nonn
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AUTHOR
| Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 23 2006
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