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 A027571 Numbers n such that n^2 + (n+1)^2 is palindromic. 3
 1, 9, 12, 16, 919, 1257, 1262, 1621, 1706, 170706, 904280, 1258182, 7901014, 8659929, 12458597, 17070706, 80472264, 1616689803, 1680689788, 1705387643, 7360311900, 8032814139, 8055329360, 12574461617, 16794058711, 165058650666, 844706005220, 1250999800012 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Giovanni Resta, Table of n, a(n) for n = 1..31 (terms < 2*10^12) P. De Geest, Palindromic Sums of Squares of Consecutive Integers PROG (PARI) isok(m) = my(d=digits(m^2+(m+1)^2)); d == Vecrev(d); \\ Michel Marcus, Jan 05 2019 CROSSREFS Cf. A027572. A050236 is a subsequence. Sequence in context: A084375 A076674 A176062 * A154631 A199593 A174525 Adjacent sequences:  A027568 A027569 A027570 * A027572 A027573 A027574 KEYWORD nonn,base AUTHOR EXTENSIONS a(17)-a(20) from Donovan Johnson, Aug 26 2012 a(21)-a(28) from Giovanni Resta, Aug 06 2019 STATUS approved

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Last modified October 19 20:55 EDT 2019. Contains 328224 sequences. (Running on oeis4.)