OFFSET
1,1
PROG
(Python)
from sympy import isprime
from itertools import count, islice
def agen(): # generator of terms
s = ""
while True:
for d in "17":
for k in count(1):
if isprime(int(s+d*k)): break
yield k
s += d*k
print(list(islice(agen(), 11))) # Michael S. Branicky, Aug 23 2022
CROSSREFS
KEYWORD
base,nonn,more
AUTHOR
Amarnath Murthy, Aug 12 2005
EXTENSIONS
a(7)-a(9) from Joshua Zucker, Jan 11 2006
a(10) and a(11) from Sean A. Irvine, Mar 22 2010
a(12)-a(14) from Michael S. Branicky, Aug 23 2022
a(15) from Michael S. Branicky, May 29 2023
STATUS
approved