OFFSET
1,1
COMMENTS
(Reversal of digits of prime p) plus 1 is square is given in A167217.
LINKS
K. D. Bajpai, Table of n, a(n) for n = 1..6696
EXAMPLE
84 is in the sequence because reversal of its digits is 48 and 48 + 1 = 49 = 7^2.
510 is in the sequence because reversal of its digits is 15 and 15 + 1 = 16 = 4^2.
MATHEMATICA
Select[Range[10^4], IntegerQ[Sqrt[FromDigits[Reverse[IntegerDigits[#]]] + 1]] &]
PROG
(PARI)
revint(n) = eval(concat(Vecrev(Str(n))))
select(n->issquare(revint(n)+1), vector(4000, n, n)) \\ Colin Barker, Jul 20 2014
CROSSREFS
KEYWORD
nonn,base
AUTHOR
K. D. Bajpai, Jul 18 2014
STATUS
approved