id:A120313 - OEIS Search Results

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a(n) = Product of k primes in arithmetic progression with common difference 6, otherwise a(n) = prime(n).

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2, 3, 623645, 124729, 11339, 19, 667, 29, 49321, 1591, 43, 146969, 3127, 59, 23569729, 386389, 71, 5767 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`a(2) = 3 beacuse 3+6 = 9 and is not prime;` `a(3) = 623645 = 511172329 and the common difference between successive primes is 6.`
	CROSSREFS	`Sequence in context: A101445 A128668 A038537 this_sequence A082871 A139627 A166926` `Adjacent sequences: A120310 A120311 A120312 this_sequence A120314 A120315 A120316`
	KEYWORD	`nonn`
	AUTHOR	`Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Jun 20 2006`

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Last modified December 17 23:40 EST 2009. Contains 171025 sequences.