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A055261 Sums of two powers of 16. 0
2, 17, 32, 257, 272, 512, 4097, 4112, 4352, 8192, 65537, 65552, 65792, 69632, 131072, 1048577, 1048592, 1048832, 1052672, 1114112, 2097152, 16777217, 16777232, 16777472, 16781312, 16842752, 17825792, 33554432, 268435457 (list; table; graph; refs; listen; history; internal format)
OFFSET

1,1

FORMULA

a(n) = 16^(n-trinv(n))+16^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)=16^n+16^k, so as a sequence a(n) =16^A002262(n)+16^A003056(n).

EXAMPLE

a(4) = 272 = 16^2+16^1

CROSSREFS

Cf. A052216.

Sequence in context: A060387 A003336 A178145 * A100294 A192453 A018529

Adjacent sequences:  A055258 A055259 A055260 * A055262 A055263 A055264

KEYWORD

base,easy,nonn,tabl

AUTHOR

Henry Bottomley (se16(AT)btinternet.com), Jun 22 2000

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Last modified February 14 22:55 EST 2012. Contains 205685 sequences.