OFFSET
1,1
COMMENTS
Members are of form 16k+11, but not all such numbers are in the sequence. The first missing number is 187.
LINKS
Michael S. Branicky, Table of n, a(n) for n = 1..10000
MATHEMATICA
Flatten[Position[Partition[Table[If[MemberQ[Partition[IntegerDigits[n, 4], 2, 1], {2, 3}], 1, 0], {n, 1000}], 2, 1], {0, 1}]] + 1 (* Vincenzo Librandi, Aug 19 2015 *)
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