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A028554 Palindromes of form n(n+3). 2
0, 4, 88, 868, 4554, 8008, 45154, 89698, 452254, 4526254, 8996998, 830333038, 862626268, 899969998, 4058008504, 45032023054, 45229592254, 89999699998, 405485584504, 4503764673054, 8187727277818, 8999996999998, 89178266287198 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Also: Palindromes that are the sum of consecutive initial even composites. Sequence 4 + 6 + 8 + 10 + 12 + 14 + ... + z = n. For values of z see A058851. (Comment added by author 12/2000).

LINKS

Table of n, a(n) for n=1..23.

P. De Geest, Palindromic Quasipronics

P. De Geest, Palindromic Sums 2

CROSSREFS

Cf. A028553, A058851.

Sequence in context: A059577 A239007 A254652 * A154137 A154136 A012830

Adjacent sequences:  A028551 A028552 A028553 * A028555 A028556 A028557

KEYWORD

nonn,base

AUTHOR

Patrick De Geest

STATUS

approved

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