OFFSET
1,3
EXAMPLE
a(11) = 10 and 1 - 0 = 1 is present in a(11);
a(12) = 12 and the absolute difference 1 - 2 = 1 is present in a(12);
a(13) = 20 and 2 - 0 = 2 is present in a(13);
a(14) = 21 and 2 - 1 = 1 is present in a(14);
a(60) = 210 and both 2 - 1 = 1 and 1 - 0 = 1 are present in a(60); etc.
MATHEMATICA
Select[Range[0, 250], ContainsAll[IntegerDigits@#, Flatten[Abs@*Differences/@ Partition[IntegerDigits@#, 2, 1]]]&] (* Giorgos Kalogeropoulos, Sep 05 2023 *)
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Eric Angelini, Sep 03 2023
STATUS
approved