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A028561 Numbers n such that n(n+6) is a palindrome. 0
0, 1, 5, 22, 137, 273, 715, 863, 2731, 8541, 486618, 877173, 1378507, 1731746, 2273915, 2436099, 5401396, 7153679, 7560069, 14529486, 23887419, 23975475 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..22.

P. De Geest, Palindromic Quasipronics of the form n(n+x)

Erich Friedman, What's Special About This Number? (See entries 863, 8541.)

MATHEMATICA

Select[Range[0, 24*10^6], PalindromeQ[#(#+6)]&] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Sep 04 2017 *)

CROSSREFS

Sequence in context: A033462 A111154 A221539 * A227918 A009638 A121942

Adjacent sequences:  A028558 A028559 A028560 * A028562 A028563 A028564

KEYWORD

nonn,base

AUTHOR

Patrick De Geest

STATUS

approved

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Last modified January 22 22:38 EST 2018. Contains 298093 sequences.