OFFSET
1,1
COMMENTS
All terms after 2 are composite.
FORMULA
a(n) = 2 * A032917(n).
MATHEMATICA
Table[Map[FromDigits, Tuples[{2, 6}, {k}]], {k, 5}] // Flatten (* Michael De Vlieger, Mar 30 2017 *)
PROG
(Magma) [n: n in [1..100000] | Set(IntegerToSequence(n, 10)) subset {2, 6}]
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Jaroslav Krizek, Mar 30 2017
STATUS
approved