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A168174 Emirps (A006567) with emirp number of digits and emirp digital sum. 2
1000000001159, 1000000002217, 1000000003463, 1000000004161, 1000000005713, 1000000005911, 1000000006037, 1000000006451, 1000000006699, 1000000007333, 1000000009403, 1000000010249, 1000000010447, 1000000010483, 1000000011019 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Last 13-digit examples: 9999999990583, 9999999990853, 9999999995191, 9999999996901, 9999999997919, 9999999998987. First examples of some digit lengths: 10^16 + {79, 1551, 3711, 7711, 9421, 9867}; 10^30 + {2613, 29979, 37857, 41461, 47577}; 10^36 + {9061, 21081, 52351, 71017, 95781}; 10^70 + {691, 19321, 203403, 225201, 231987}; 10^72 + {97167, 158637, 227001, 233679, 265021}. ... and skipping a few other legal lengths... 10^148 + 53967 -- Jack Brennen
LINKS
FORMULA
{p: p in A006567 and A055642(p) in A006567 and A007953(p) in A006567}.
EXAMPLE
a(1) = 1000000001159, which is prime, and R(1000000001159) = 951100000000 is prime, and sod(1000000001159) = 17 is prime, and R(17) = 71 is prime.
CROSSREFS
Sequence in context: A017280 A017520 A017652 * A291321 A233479 A368035
KEYWORD
base,nonn
AUTHOR
Jonathan Vos Post, Nov 19 2009
STATUS
approved

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Last modified March 28 05:39 EDT 2024. Contains 371235 sequences. (Running on oeis4.)