id:A121944 - OEIS Search Results

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A121944

Composite number of the form 4n^2+1.

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1

65, 145, 325, 485, 785, 901, 1025, 1157, 1445, 1765, 1937, 2117, 2305, 2501, 2705, 3365, 3601, 3845, 4097, 4625, 4901, 5185, 5777, 6085, 6401, 6725, 7397, 7745, 8465, 9217, 9605, 10001, 10405, 10817, 11237, 11665, 12545, 12997, 13925, 14885, 16385 (list; graph; listen)

	OFFSET	`1,1`
	MATHEMATICA	`Select[Table[4n^2 + 1, {n, 70}], ! PrimeQ[ # ] &]`
	CROSSREFS	`a(n) are elements of A053755 = 4*n^2 + 1, beside 1 that are not prime, that is they do not lie in A002496 = Primes of form n^2 + 1.` `Sequence in context: A158071 A073631 A092226 this_sequence A044316 A044697 A044397` `Adjacent sequences: A121941 A121942 A121943 this_sequence A121945 A121946 A121947`
	KEYWORD	`nonn`
	AUTHOR	`Tanya Khovanova (tanyakh(AT)yahoo.com), Sep 03 2006`

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Last modified December 19 12:50 EST 2009. Contains 171053 sequences.

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