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A245361 Numbers n such that (reversal of digits of n) + 1 is a square (ignoring leading zeros). 3
3, 8, 30, 36, 42, 51, 53, 80, 84, 99, 300, 323, 341, 360, 384, 387, 420, 422, 426, 510, 530, 552, 575, 576, 591, 800, 825, 827, 840, 861, 882, 990, 993, 998, 3000, 3032, 3069, 3072, 3201, 3230, 3264, 3276, 3410, 3441, 3477, 3483, 3600, 3633, 3648, 3671, 3806 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
(Reversal of digits of prime p) plus 1 is square is given in A167217.
LINKS
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
Sequence in context: A208678 A162054 A289486 * A247340 A067354 A344899
KEYWORD
nonn,base
AUTHOR
K. D. Bajpai, Jul 18 2014
STATUS
approved

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Last modified May 24 01:38 EDT 2024. Contains 372768 sequences. (Running on oeis4.)