Base-7 palindromes that start with 5.

Terms

a(0) =5a(1) =40a(2) =250a(3) =257a(4) =264a(5) =271a(6) =278a(7) =285a(8) =292a(9) =1720a(10) =1776a(11) =1832a(12) =1888a(13) =1944a(14) =2000a(15) =2056a(16) =12010a(17) =12059a(18) =12108a(19) =12157a(20) =12206a(21) =12255a(22) =12304a(23) =12360a(24) =12409a(25) =12458a(26) =12507a(27) =12556a(28) =12605a(29) =12654