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A110781
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Number of digits in A110780(n).
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14
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OFFSET
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1,1
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COMMENTS
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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 "19":
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,more
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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