id:A143427 - OEIS Search Results

Search: id:A143427

Displaying 1-1 of 1 results found.

page 1

a(n)=least prime == -1 mod 6 such that q(n)*(q(n)+a(n))-1 is prime with q(i)=i-th prime == 1 mod 6.

+0
4

5, 5, 11, 11, 5, 5, 11, 23, 5, 11, 17, 41, 23, 5, 11, 17, 29, 17, 17, 11, 47, 41, 11, 11, 41, 11, 29, 41, 5, 11, 29, 17, 11, 5, 47, 17, 17, 53, 11, 5, 17, 17, 47, 29, 11, 23, 11, 5, 17, 5, 17, 29, 11, 17, 29, 11, 17, 5, 11, 17, 5, 17, 17, 29, 17, 17, 5, 23, 23, 11, 113, 17, 113, 5 (list; graph; listen)

	OFFSET	`1,1`
	LINKS	`Pierre CAMI, Table of n, a(n) for n = 1..10000`
	EXAMPLE	`q(1)=7, 7(7+5)-1=83 prime, 5 prime == -1 mod 6 so a(1)=5` `q(2)=13, 13(13+5)-1=233 prime, so a(2)=5` `q(3)=19, 19(19+5)-1=455 composite 19(19+11)-1=569 prime, 11 prime == -1 mod 6 so a(3)=11`
	CROSSREFS	`Cf. A143428, A143429, A143430.` `Sequence in context: A151728 A130889 A058610 this_sequence A101203 A141244 A121849` `Adjacent sequences: A143424 A143425 A143426 this_sequence A143428 A143429 A143430`
	KEYWORD	`nonn`
	AUTHOR	`Pierre CAMI (pierrecami(AT)tele2.fr), Aug 14 2008`

page 1

Search completed in 0.002 seconds

Last modified November 24 23:16 EST 2009. Contains 167481 sequences.

AT&T Labs Research