A053779 Numbers k such that the sum of the first k composite numbers is palindromic.

1, 22, 24, 167, 202, 226, 1443, 2380, 3190, 3952, 4220, 16827, 26304, 37612, 40813, 213501, 376524, 1920079, 2061085, 2635057, 3463613, 4268588, 16513206, 68101132, 166428703, 207224360, 403784450, 421279478, 1384813481

Offset

1,2

Comments

Sequence lists numbers k such that 4 + 6 + 8 + 9 + 10 + 12 + ... + composite(k) is palindromic. For the corresponding values of composite(k) see A057959.

Links

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

P. De Geest, Palindromic Sums

C. Rivera, PrimePuzzle 89

Mathematica

Position[Accumulate[Select[Range[146*10^7], CompositeQ]], _?(PalindromeQ[ #] &)] // Flatten (* Harvey P. Dale, Sep 29 2018 *)

Crossrefs

Cf. A002808, A002113, A053780.

Sequence in context: A181454 A155911 A061411 * A177734 A177055 A186780

Adjacent sequences: A053776 A053777 A053778 * A053780 A053781 A053782

Keyword

base,nonn

Author

G. L. Honaker, Jr., Mar 29 2000

Extensions

More terms from G. L. Honaker, Jr., Mar 29 2000

Further terms added by Patrick De Geest, Nov 15 2000

Status

approved