OFFSET
1,1
COMMENTS
There are 37 different values that can appear in this sequence, the last of which does not appear until a(560) = 49.
EXAMPLE
The fifth digit of Pi is 5 and the sixth is 9, so a(5) = 45.
MATHEMATICA
d = RealDigits[Pi, 10, 76][[1]]; Most[d] * Rest[d] (* Amiram Eldar, Jul 08 2020 *)
CROSSREFS
KEYWORD
nonn,base,less,easy
AUTHOR
J. Marcel Feenstra, Jul 08 2020
STATUS
approved