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A110789
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Number of digits in A110788(n).
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10
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1, 1, 2, 4, 5, 10, 23, 102, 102, 138, 451, 1922, 1624, 5630
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,3
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LINKS
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PROG
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(Python)
from sympy import isprime
from itertools import count, islice
def agen(): # generator of terms
s = ""
while True:
for d in "71":
for k in count(1):
if isprime(int(s+d*k)): break
yield k
s += d*k
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CROSSREFS
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KEYWORD
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base,nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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