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A227861 Sum i + j for integers 2^i*3^j (A033845). 1
2, 3, 3, 4, 4, 5, 4, 5, 6, 5, 6, 5, 7, 6, 7, 6, 8, 7, 6, 8, 7, 9, 8, 7, 9, 8, 7, 10, 9, 8, 10, 9, 8, 11, 10, 9, 8, 11, 10, 9, 12, 11, 10, 9, 12, 11, 10, 13, 9, 12, 11, 10, 13, 12, 11, 14, 10, 13, 12, 11, 14, 10, 13, 12, 15, 11, 14, 13, 12, 15, 11, 14, 13, 16, 12, 15, 11, 14, 13, 16, 12, 15, 14, 17, 13, 16, 12, 15, 14, 17, 13, 16, 12, 15, 18, 14, 17, 13 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Upper and lower boundaries of the graph are almost exactly quadratic curves.

LINKS

Zak Seidov, Table of n, a(n) for n = 1..10000

FORMULA

a(n) = A191475(n) + A191476(n).

EXAMPLE

a(10) = 5 because A033845(10) = 108 = 2^2 + 3^3 => A191475(10) = 2, A191476(10) = 3.

CROSSREFS

Cf. A033845, A191475, A191476.

Sequence in context: A061339 A073933 A056792 * A256544 A130500 A072073

Adjacent sequences:  A227858 A227859 A227860 * A227862 A227863 A227864

KEYWORD

nonn

AUTHOR

Zak Seidov, Nov 01 2013

STATUS

approved

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Last modified July 28 12:48 EDT 2017. Contains 289889 sequences.