A352239 Numbers k such that the decimal expansion of k and 14^k both begin with 14.

1404, 1445, 1486, 1493, 14023, 14071, 14112, 14153, 14160, 14201, 14242, 14283, 14290, 14331, 14372, 14379, 14420, 14461, 14502, 14509, 14550, 14591, 14639, 14680, 14721, 14728, 14769, 14810, 14851, 14858, 14899, 14940, 14947, 14988, 140029, 140070, 140118, 140159

Offset

1,1

Comments

Subsequence of A352179.

Links

Chai Wah Wu, Table of n, a(n) for n = 1..4098

Example

Both 1404 and 14^1404 = 1458... start with the digits 14.

Prog

(Python)
from itertools import count, islice
def A352239_gen(): # generator of terms
    for l in count(0):
        k14 = 14**(14*10**l)
        for k in range(14*10**l, 15*10**l):
            if str(k14)[:2] == '14':
                yield k
            k14 *= 14
A352239_list = list(islice(A352239_gen(), 20))

Crossrefs

Cf. A352179.

Sequence in context: A178271 A271579 A271712 * A206680 A022058 A107522

Adjacent sequences: A352236 A352237 A352238 * A352240 A352241 A352242

Keyword

nonn,base

Author

Chai Wah Wu, Mar 08 2022

Status

approved