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A027725
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Palindromes of form k^2 + k + 8.
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3
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8, 878, 41014, 81518, 8558558, 8617168, 415242514, 874414478, 88279997288, 8035521255308, 8053537353508, 8942435342498, 8984014104898, 82375268486257328, 8563985811185893658, 41023644811311844632014, 87279499176567199497278, 462070049490878094940070264, 467190356216898612653091764
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history;
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OFFSET
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1,1
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COMMENTS
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Palindromes h such that 4*h - 31 is a square. - Bruno Berselli, Aug 29 2018
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LINKS
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Table of n, a(n) for n=1..19.
P. De Geest, Palindromic Quasi_Over_Squares of the form n^2+(n+X)
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MATHEMATICA
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palQ[n_] := Block[{d = IntegerDigits[n]}, d == Reverse[d]]; f[n_] := n^2 + n + 8; Select[f@ Range[0, 3*10^5], palQ] (* Giovanni Resta, Aug 29 2018 *)
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CROSSREFS
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Cf. A027724, A027693, A027723, A027727.
Sequence in context: A097818 A262379 A175411 * A265239 A290023 A112578
Adjacent sequences: A027722 A027723 A027724 * A027726 A027727 A027728
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KEYWORD
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nonn,base
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AUTHOR
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Patrick De Geest
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EXTENSIONS
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a(14)-a(19) from Giovanni Resta, Aug 29 2018
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STATUS
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approved
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