A181732 - OEIS

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A181732

Numbers n such that 90n + 1 is prime.

2, 3, 6, 7, 9, 11, 13, 17, 18, 20, 24, 25, 26, 28, 31, 33, 34, 37, 39, 41, 45, 47, 51, 54, 55, 62, 65, 68, 69, 70, 72, 73, 74, 76, 84, 86, 89, 90, 91, 94, 96, 97, 98, 100, 101, 102, 107, 108, 109, 110, 117, 119, 121, 123, 124, 125, 130, 133, 136, 138, 139, 140 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,1`
	LINKS	`Alois P. Heinz, Table of n, a(n) for n = 1..10000`
	FORMULA	`a(n) = (1/90) [A142312(n) - 1].`
	MAPLE	`a:= proc(n) option remember; local k;` for k from 1+ `if`(n=1, 1, a(n-1)) `while not isprime(90*k+1) do od; k` `end:` `seq(a(n), n=1..100); # Alois P. Heinz, Dec 05 2011`
	CROSSREFS	`Cf. A142312. Complement of A255491.` `Sequence in context: A201734 A259726 A259587 * A190199 A014873 A029467` `Adjacent sequences: A181729 A181730 A181731 * A181733 A181734 A181735`
	KEYWORD	`nonn,easy`
	AUTHOR	`J. W. Helkenberg, Nov 16 2010`
	EXTENSIONS	`New name by Michael B. Porter, Jul 26 2013`
	STATUS	`approved`

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Last modified September 10 19:13 EDT 2015. Contains 261502 sequences.