A245361 - OEIS

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A245361

Numbers n such that (reversal of digits of n) + 1 is a square (ignoring leading zeros).

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

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

Cf. A000290, A061230, A061457, A167217.

Sequence in context: A208678 A162054 A289486 * A247340 A067354 A344899

Adjacent sequences: A245358 A245359 A245360 * A245362 A245363 A245364

KEYWORD

nonn,base

AUTHOR

K. D. Bajpai, Jul 18 2014

STATUS

approved