A352179 Numbers k such that the decimal expansion of 14^k begins with 14.

1, 8, 49, 90, 97, 138, 179, 220, 227, 268, 309, 357, 398, 439, 446, 487, 528, 569, 576, 617, 658, 665, 706, 747, 788, 795, 836, 877, 925, 966, 1007, 1014, 1055, 1096, 1137, 1144, 1185, 1226, 1233, 1274, 1315, 1356, 1363, 1404, 1445, 1486, 1493, 1534, 1575, 1582

Offset

1,2

References

E.-B. Escott, Query 2691, L'Intermédiaire des Mathématiciens, 11 (1904), 244-245.

Links

Table of n, a(n) for n=1..50.

Prog

(Python)
from itertools import islice
def A352179_gen(startvalue=1): # generator of terms >= startvalue
    k = max(startvalue, 1)
    k14 = 14**k
    while True:
        if str(k14)[:2] == '14':
            yield k
        k += 1
        k14 *= 14
A352179_list = list(islice(A352179_gen(), 10)) # Chai Wah Wu, Mar 08 2022

Crossrefs

Sequence in context: A305226 A304771 A316514 * A304468 A272713 A316285

Adjacent sequences: A352176 A352177 A352178 * A352180 A352181 A352182

Keyword

nonn,base

Author

N. J. A. Sloane, Mar 08 2022

Status

approved