id:A105783 - OEIS Search Results

Search: id:A105783

Displaying 1-1 of 1 results found.

page 1

Number of terms among the first n primes that are divisors of the sum of the first n primes.

+0
2

1, 0, 2, 0, 2, 0, 1, 2, 2, 1, 2, 0, 3, 0, 2, 1, 3, 1, 1, 2, 1, 1, 3, 1, 3, 2, 2, 1, 3, 2, 3, 1, 3, 1, 1, 1, 3, 2, 3, 2, 3, 1, 3, 1, 3, 1, 2, 2, 3, 3, 3, 2, 4, 1, 1, 3, 4, 2, 1, 0, 2, 1, 2, 0, 1, 2, 2, 3, 2, 3, 3, 1, 3, 1, 1, 2, 4, 1, 3, 3, 1, 1, 1, 4, 3, 2, 4, 3, 3, 3, 4, 1, 1, 2, 1, 0, 2, 3, 2, 0, 2, 0, 4, 1, 4 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`Sequence inspired by A102863 (Giovanni Teofilatto).`
	EXAMPLE	`a(2)=0 because neither 2 nor 3 is a divisor of 5; a(5)=2 because exactly two terms from {2,3,5,7,11} are divisors of 2+3+5+7+11=28.`
	MAPLE	`with(numtheory): a:=n->nops(factorset(sum(ithprime(k), k=1..n)) intersect {seq(ithprime(j), j=1..n)}): seq(a(n), n=1..130);`
	CROSSREFS	`Cf. A102863.` `Adjacent sequences: A105780 A105781 A105782 this_sequence A105784 A105785 A105786` `Sequence in context: A029401 A086150 A105166 this_sequence A022879 A064984 A038555`
	KEYWORD	`nonn`
	AUTHOR	`Emeric Deutsch (deutsch(AT)duke.poly.edu), Apr 19 2005`

page 1

Search completed in 0.002 seconds

Last modified October 6 16:13 EDT 2008. Contains 144667 sequences.

AT&T Labs Research