OFFSET
1,1
LINKS
Michael S. Branicky, Table of n, a(n) for n = 1..10000
PROG
(Python)
from sympy.ntheory.factor_ import digits
def has23(n): return "23" in "".join(map(str, digits(n, 4)[1:]))
def ok(n): return has23(n) and not has23(n+1)
print([k for k in range(972) if ok(k)]) # Michael S. Branicky, Nov 27 2021
CROSSREFS
KEYWORD
nonn,base
AUTHOR
EXTENSIONS
a(48) and beyond from Michael S. Branicky, Nov 27 2021
STATUS
approved