id:A075882 - OEIS Search Results

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a(n) = phi(Sum_{i=1,...,n} prime(i)).

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1, 4, 4, 16, 12, 40, 28, 60, 40, 84, 64, 196, 96, 280, 160, 252, 160, 332, 280, 420, 352, 672, 396, 636, 416, 756, 624, 912, 576, 1044, 672, 1232, 840, 1416, 1136, 1616, 1152, 2640, 1380, 1764, 1540, 2292, 1696, 2552, 1872, 2816, 1896, 4524, 2208, 4032, 2120 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`The sum of the first three primes = 10 and phi(10) = 4, so a(3) = 4.`
	MATHEMATICA	`Table[EulerPhi[Sum[Prime[k], {k, 1, i}]], {i, 1, 100}]`
	CROSSREFS	`Sequence in context: A127473 A079611 A160020 this_sequence A125757 A056450 A141125` `Adjacent sequences: A075879 A075880 A075881 this_sequence A075883 A075884 A075885`
	KEYWORD	`nonn`
	AUTHOR	`Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Oct 16 2002`

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

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