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A027720 Palindromes of form n^2 + 1. 4
1, 2, 5, 101, 626, 10001, 1000001, 1040401, 2217122, 5053505, 100000001, 101808101, 10000000001, 10182828101, 10408080401, 28053235082, 1000000000001, 1000400040001, 1018262628101, 7534662664357 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

LINKS

P. De Geest, Palindromic incremented squares of the form n^2+1

CROSSREFS

Cf. A002522, A027719.

Sequence in context: A162569 A120800 A066618 * A132482 A136106 A122696

Adjacent sequences:  A027717 A027718 A027719 * A027721 A027722 A027723

KEYWORD

nonn,base

AUTHOR

Patrick De Geest (pdg(AT)worldofnumbers.com)

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Last modified February 12 07:22 EST 2012. Contains 205378 sequences.