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A078444 Integer part of geometrical average of consecutive primes. 1
2, 3, 5, 8, 11, 14, 17, 20, 25, 29, 33, 38, 41, 44, 49, 55, 59, 63, 68, 71, 75, 80, 85, 92, 98, 101, 104, 107, 110, 119, 128, 133, 137, 143, 149, 153, 159, 164, 169, 175, 179, 185, 191, 194, 197, 204, 216, 224, 227, 230, 235, 239, 245, 253, 259, 265, 269, 273, 278 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

COMMENTS

For n > 1, a(n) = prime(n) iff prime(n) and prime(n+1) are twins

FORMULA

a(n) = floor(sqrt(prime(n)*prime(n+1)))

EXAMPLE

a(7) = floor(sqrt(prime(7)*prime(8))) = 17

CROSSREFS

Sequence in context: A171048 A185371 A071894 * A194221 A054925 A194248

Adjacent sequences:  A078441 A078442 A078443 * A078445 A078446 A078447

KEYWORD

nonn

AUTHOR

Lior Manor (lior.manor(AT)gmail.com) Dec 31 2002

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Last modified February 17 16:13 EST 2012. Contains 206050 sequences.