OFFSET
1,1
EXAMPLE
624 = 4444_5 = 1551_7.
19040 is a four-digit palindrome in bases 13, 15, and 19: 19040 = 8888_13 = 5995_15 = {2,14,14,2}_19.
PROG
(PARI) isok(m) = {my(nb = 0); for (b=2, m-1, my(d=digits(m, b)); if ((#d == 4) && (Vecrev(d) == d), nb++); if (nb == 2, return (1)); ); } \\ Michel Marcus, Feb 13 2021
CROSSREFS
KEYWORD
nonn,base
AUTHOR
John L. Drost, Sep 05 2010
STATUS
approved