A027574 Palindromes of form n^2 + (n+1)^2 + (n+2)^2.

77, 434, 4334, 964469, 9051509, 208666802, 776181677, 924323429, 964777469, 4106556014, 4906666094, 43064746034, 90553635509, 430495594034, 5291716171925, 9203225223029, 9459406049549, 58815733751885, 202304919403202, 962227252722269, 4906073553706094

Offset

1,1

Links

Table of n, a(n) for n=1..21.

P. De Geest, Palindromic Sums of Squares of Consecutive Integers

Mathematica

Select[Total/@Partition[Range[405*10^5]^2, 3, 1], PalindromeQ] (* Harvey P. Dale, Jan 21 2025 *)

Crossrefs

Cf. A027573.

Sequence in context: A020206 A020304 A154058 * A059047 A046149 A222728

Adjacent sequences: A027571 A027572 A027573 * A027575 A027576 A027577

Keyword

nonn,base,changed

Author

Patrick De Geest

Extensions

a(18)-a(21) from Donovan Johnson, Aug 26 2012

Status

approved