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A037327
Numbers whose base-6 and base-7 expansions have the same digit sum.
0
1, 2, 3, 4, 5, 66, 67, 68, 69, 126, 127, 128, 129, 130, 131, 156, 157, 158, 159, 160, 189, 190, 191, 246, 247, 248, 249, 250, 251, 280, 281, 308, 309, 310, 311, 366, 367, 368, 369, 370, 396, 397, 398, 456, 457, 458, 459, 460, 461, 518, 519, 520, 521, 546, 547
OFFSET
1,2
FORMULA
{n: A053827(n) = A053828(n)}. - R. J. Mathar, Jun 30 2021
PROG
(PARI) isok(k) = sumdigits(k, 6) == sumdigits(k, 7); \\ Michel Marcus, Mar 18 2023
(Python)
from numpy import base_repr
def ok(n):
return sum(map(int, base_repr(n, 6))) == sum(map(int, base_repr(n, 7)))
print([n for n in range(1, 10**5) if ok(n)])
# Christoph B. Kassir, Apr 05 2023
CROSSREFS
Sequence in context: A069881 A004856 A325653 * A075832 A037434 A033170
KEYWORD
nonn,base
STATUS
approved