A073218 The terms of A055258 (sums of two powers of 7) divided by 2.

1, 4, 7, 25, 28, 49, 172, 175, 196, 343, 1201, 1204, 1225, 1372, 2401, 8404, 8407, 8428, 8575, 9604, 16807, 58825, 58828, 58849, 58996, 60025, 67228, 117649, 411772, 411775, 411796, 411943, 412972, 420175, 470596, 823543

Offset

1,2

Links

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

Formula

(7^n + 7^m) / 2, n = 0, 1, 2, 3 ..., m = 0, 1, 2, 3, ... n.

Example

a(4) = 25 = (7^2+7^0) / 2

Crossrefs

Cf. A055258.

Sequence in context: A079441 A129418 A372169 * A276288 A219700 A151348

Adjacent sequences: A073215 A073216 A073217 * A073219 A073220 A073221

Keyword

easy,nonn

Author

Jeremy Gardiner, Jul 21 2002

Status

approved