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A028336 Numbers n such that n*(n+1) is a palindrome. 2
1, 2, 16, 77, 538, 1621, 2457, 5291, 5313, 52008, 142401, 143498, 1610151, 1713543, 4670028, 5218983, 15137566, 15282411, 15814148, 47370058, 50702751, 142594226, 166691108, 1694576061, 2554554552, 25541432472 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..26.

P. De Geest, Palindromic pronic numbers of the form n(n+1)

Eric Weisstein's World of Mathematics, Palindromic Number.

Eric Weisstein's World of Mathematics, Pronic Number.

MATHEMATICA

Select[Range[500000], PalindromeQ[#(#+1)] &] (* or *) Select[Range[50000], IntegerDigits[#(#+1)] == Reverse[ IntegerDigits[#(#+1)]] &] (* G. C. Greubel, Nov 24 2016 *)

CROSSREFS

Cf. A028337.

Sequence in context: A216424 A212897 A034581 * A244717 A208102 A207723

Adjacent sequences:  A028333 A028334 A028335 * A028337 A028338 A028339

KEYWORD

nonn,base,changed

AUTHOR

Patrick De Geest

STATUS

approved

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Last modified December 5 03:26 EST 2016. Contains 278755 sequences.