A110783 Number of digits in A110782(n).

2, 1, 3, 3, 2, 8, 21, 102, 25, 726, 954

Offset

1,1

Comments

a(12) > 7300. - Michael S. Branicky, Aug 24 2022

Links

Table of n, a(n) for n=1..11.

Prog

(Python)
from sympy import isprime
from itertools import count, islice
def agen(): # generator of terms
    s = ""
    while True:
        for d in "1379":
            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 24 2022

Crossrefs

Cf. A110774, A110775, A110776, A110777, A110778, A110780, A110781, A110782.

Sequence in context: A128182 A059739 A035566 * A333224 A124770 A334300

Adjacent sequences: A110780 A110781 A110782 * A110784 A110785 A110786

Keyword

base,nonn,more

Author

Amarnath Murthy, Aug 12 2005

Extensions

More terms from Joshua Zucker, Jan 11 2006

a(11) from Sean A. Irvine, Mar 22 2010

Status

approved