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A058851
Sum of even composites up to n is palindromic.
3
4, 18, 58, 134, 178, 424, 598, 1344, 4254, 5998, 57630, 58740, 59998, 127404, 424414, 425344, 599998, 1273554, 4244414, 5722840, 5999998, 18886848, 42683384, 57725768, 59999998, 424650414, 578107368, 588254658, 588349340
OFFSET
1,1
COMMENTS
Sequence is 4 + 6 + 8 + 10 + 12 + 14 + ... + n.
6*10^n-2 for n >=0 are terms. - Chai Wah Wu, Feb 20 2021
LINKS
FORMULA
a(n) = 2*(1+A028553(1+n)). - R. J. Mathar, Sep 09 2015
CROSSREFS
Sequence in context: A212680 A027286 A119044 * A167885 A212521 A278406
KEYWORD
nonn,base
AUTHOR
Patrick De Geest, Dec 15 2000
STATUS
approved