A073217 The terms of A055237 (sums of two powers of 5) divided by 2.

1, 3, 5, 13, 15, 25, 63, 65, 75, 125, 313, 315, 325, 375, 625, 1563, 1565, 1575, 1625, 1875, 3125, 7813, 7815, 7825, 7875, 8125, 9375, 15625, 39063, 39065, 39075, 39125, 39375, 40625, 46875, 78125

Offset

1,2

Links

Table of n, a(n) for n=1..36.

Formula

(5^n + 5^m) / 2, n = 0, 1, 2, 3 ..., m = 0, 1, 2, 3, ... n.

Example

a(4) = 13 = (5^2+5^0) / 2

Crossrefs

Cf. A055237.

Sequence in context: A293863 A086769 A018753 * A063484 A057920 A018329

Adjacent sequences: A073214 A073215 A073216 * A073218 A073219 A073220

Keyword

easy,nonn

Author

Jeremy Gardiner, Jul 21 2002

Status

approved