A073220 Terms of A072390 (sums of two powers of 13) divided by 2.

1, 7, 13, 85, 91, 169, 1099, 1105, 1183, 2197, 14281, 14287, 14365, 15379, 28561, 185647, 185653, 185731, 186745, 199927, 371293, 2413405, 2413411, 2413489, 2414503, 2427685, 2599051, 4826809, 31374259, 31374265, 31374343, 31375357

Offset

1,2

Links

Table of n, a(n) for n=1..32.

Formula

(13^n + 13^m) / 2, n = 0, 1, 2, 3 ..., m = 0, 1, 2, 3, ... n.

Example

a(4) = 85 = (11^2+11^0) / 2

Mathematica

Union[Total/@Tuples[13^Range[0, 9], 2]]/2 (* Harvey P. Dale, Sep 15 2011 *)

Crossrefs

Cf. A072390.

Sequence in context: A268350 A061521 A362246 * A110455 A177952 A320461

Adjacent sequences: A073217 A073218 A073219 * A073221 A073222 A073223

Keyword

easy,nonn

Author

Jeremy Gardiner, Jul 21 2002

Status

approved