login
A191322
Number of bases in which both n and the reversal of n are 3-digit numbers.
3
0, 0, 0, 1, 1, 1, 1, 0, 1, 0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1, 2, 1, 1, 2, 2, 1, 1, 2, 0, 0, 1, 2, 2, 2, 3, 2, 2, 2, 0, 0, 1, 2, 3, 3, 2, 2, 2, 3, 0, 1, 2, 2, 3, 4, 2, 3, 3, 3, 0, 1, 2, 3, 2, 2, 4, 4, 4, 4, 0, 0, 1, 2, 2, 1, 4, 4, 4, 4, 0, 0, 1
OFFSET
1,22
FORMULA
a(n) = a(inv(n)).
a(A002113(n)) = A191291(A002113(n)).
a(n) <= min(A191291(n),A191291(inv(n))).
EXAMPLE
a(36)=3 since 36 is 3-digit number in bases 4,5,6 and 63 is 3-digit number in bases 4,5,6,7 such that we have 3 common bases.
CROSSREFS
Sequence in context: A126207 A276711 A351451 * A264840 A308188 A046219
KEYWORD
nonn,base
AUTHOR
Vladimir Shevelev, May 30 2011
STATUS
approved