OFFSET
1,2
COMMENTS
EXAMPLE
a(1) = 1 is the smallest power of 2 whose symmetric representation of sigma has width pattern (1).
a(2) = 3 is the smallest odd prime whose symmetric representation of sigma has width pattern (1 0 1).
a(4) = 9 is the first number whose symmetric representation of sigma has width pattern (1 0 1 0 1). The infinitely many numbers 2^s * p^2, s >= 0 and p an odd prime larger than 2^(s+1), have the same width pattern.
MATHEMATICA
(* function a341969[ ] is defined in A341969 *)
a342594[n_] := Module[{listW={}, listK={}, k, w}, For[k=1, k<=n, k++, w=a341969[k]; If[!MemberQ[listW, w], AppendTo[listW, w]; AppendTo[listK, k]]]; listK]
a342594[990] (* 64 entries; the 64th new pattern is encountered at n=990 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Hartmut F. W. Hoft, Mar 16 2021
STATUS
approved