id:A080478 - OEIS Search Results

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Smallest k>a(n-1) such that k^2+a(n-1)^2 is prime, starting with a(1)=1. Square roots of A062067(n).

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1, 2, 3, 8, 13, 20, 23, 30, 31, 44, 49, 74, 79, 80, 89, 96, 101, 104, 105, 116, 119, 124, 131, 134, 139, 140, 149, 150, 157, 158, 165, 172, 173, 178, 183, 202, 203, 230, 231, 250, 257, 260, 261, 274, 289, 290, 291, 296, 311, 334, 335, 342, 343, 360, 367, 372 (list; graph; listen)

	OFFSET	`1,2`
	LINKS	`Zak Seidov, Table of n, a(n) for n = 1..1000.`
	PROGRAM	`(PARI) p=1; print1(p", "); for(n=2, 1000, if(isprime(p+n^2), print1(n", "); p=n^2))`
	CROSSREFS	`Sequence in context: A067853 A086590 A127484 this_sequence A002053 A102315 A142880` `Adjacent sequences: A080475 A080476 A080477 this_sequence A080479 A080480 A080481`
	KEYWORD	`nonn`
	AUTHOR	`Ralf Stephan (ralf(AT)ark.in-berlin.de), Mar 22 2003`
	EXTENSIONS	`PARI program corrected by Zak Seidov, Apr 14 2008`

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Last modified December 16 17:18 EST 2009. Contains 170825 sequences.

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