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A073218
The terms of A055258 (sums of two powers of 7) divided by 2.
1
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
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
KEYWORD
easy,nonn
AUTHOR
Jeremy Gardiner, Jul 21 2002
STATUS
approved