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A055259 Sums of two powers of 8. 1
2, 9, 16, 65, 72, 128, 513, 520, 576, 1024, 4097, 4104, 4160, 4608, 8192, 32769, 32776, 32832, 33280, 36864, 65536, 262145, 262152, 262208, 262656, 266240, 294912, 524288, 2097153, 2097160, 2097216, 2097664, 2101248, 2129920, 2359296, 4194304, 16777217 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

T. D. Noe, Rows n = 0..100 of triangle, flattened

FORMULA

a(n) = 8^(n-trinv(n))+8^trinv(n), where trinv(n) = floor((1+sqrt(1+8*n))/2) = A002262(n) and n-trinv(n) = A003056(n)

Regarded as a triangle T(n, k) = 8^n + 8^k, so as a sequence a(n) = 8^A002262(n) + 8^A003056(n).

MATHEMATICA

Union[Total/@Tuples[8^Range[0, 10], {2}]]  (* Harvey P. Dale, Mar 13 2011 *)

CROSSREFS

Cf. A052216.

Sequence in context: A304974 A075645 A185252 * A032299 A032211 A032136

Adjacent sequences:  A055256 A055257 A055258 * A055260 A055261 A055262

KEYWORD

easy,nonn,tabl

AUTHOR

Henry Bottomley, Jun 22 2000

STATUS

approved

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Last modified October 25 19:28 EDT 2020. Contains 338012 sequences. (Running on oeis4.)