A057959 Sum of composite numbers up to n is palindromic.

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

Offset: 1

Author

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

Keywords

• base
• nonn

Comments

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

Links

• Patrick De Geest, Palindromic Sums.
• Carlos Rivera, Puzzle 89, The Prime Puzzles & Problems Connection.

Crossrefs

Cf. A002113, A002808, A053779, A053780.

Formula

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