A068658 Primes in A068657.

31, 421, 521, 631, 9421, 14731, 15731, 189421, 36189421, 39199421, 492412631, 542713631, 603015731, 7236189421, 7537189421, 97482412631, 99492412631, 102512512631, 107532613631, 114572814731, 1477336189421, 18291452211521, 18693462311521, 19396482412631

Offset

1,1

Links

Michael S. Branicky, Table of n, a(n) for n = 1..10000

Prog

(Python)
from sympy import isprime
from itertools import count, islice
def agen(): # generator of terms
    for k in count(1):
        s = str(k)
        while k != 1:
            k //= 2
            s += str(k)
        t = int(str(s))
        if isprime(t):
            yield t
print(list(islice(agen(), 24))) # Michael S. Branicky, Mar 27 2024

Crossrefs

Cf. A068657.

Sequence in context: A089375 A069582 A175355 * A068672 A274202 A352606

Adjacent sequences: A068655 A068656 A068657 * A068659 A068660 A068661

Keyword

base,nonn

Author

Amarnath Murthy, Feb 28 2002

Extensions

More terms from Sascha Kurz, Mar 26 2002

Corrected and extended by Sean A. Irvine, Mar 27 2024

Status

approved