OFFSET
1,1
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..400
EXAMPLE
307 is prime and 703=T(73).
MATHEMATICA
Select[Prime[Range[20000]], OddQ[Sqrt[1+8IntegerReverse[#]]]&] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Jun 01 2019 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Giovanni Resta, Jan 31 2006
STATUS
approved