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A057959 Sum of composite numbers up to n is palindromic. 1
4, 34, 36, 215, 258, 288, 1711, 2785, 3708, 4572, 4873, 18986, 29509, 42005, 45534, 234272, 411232, 2074123, 2225480, 2841251, 3728941, 4590401, 17643216, 72349270, 176262062, 219311147, 426454179, 444875288, 1457527586 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Sequence is 4 + 6 + 8 + 9 + 10 + 12 + ... + n.

LINKS

Table of n, a(n) for n=1..29.

Patrick De Geest, Palindromic Sums.

Carlos Rivera, Puzzle 89, The Prime Puzzles & Problems Connection.

FORMULA

a(n) = A002808(A053779(n)). - R. J. Mathar, Sep 09 2015

CROSSREFS

Cf. A002113, A002808, A053779, A053780.

Sequence in context: A058153 A020197 A102959 * A220168 A227397 A281827

Adjacent sequences:  A057956 A057957 A057958 * A057960 A057961 A057962

KEYWORD

base,nonn

AUTHOR

G. L. Honaker, Jr. and Patrick De Geest, Nov 15 2000

STATUS

approved

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Last modified November 23 21:51 EST 2020. Contains 338603 sequences. (Running on oeis4.)