A176557 - OEIS

The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

Thanks to everyone who made a donation during our annual appeal!
To see the list of donors, or make a donation, see the OEIS Foundation home page.

A176557

Primes of the form 7*x^2 - 5*y^2, where x and y are successive natural numbers.

7, 23, 43, 67, 127, 163, 347, 463, 743, 823, 907, 1087, 1283, 1607, 1723, 2503, 2647, 3767, 3943, 5923, 6143, 6367, 6827, 7547, 8563, 9643, 9923, 11083, 11383, 13267, 14947, 15647, 16363, 17467, 18223, 19387, 20183, 21407, 24847, 25747, 26203 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,1`
	COMMENTS	`a(n) is congruent 3 mod 4.` `Primes of the form 2x^2+10x-5, x>=1. [From R. J. Mathar and Vincenzo Librandi, Apr 21 2010]`
	LINKS	`Table of n, a(n) for n=1..41.`
	CROSSREFS	`Cf. A176470` `Sequence in context: A031095 A319050 A031371 * A000353 A097149 A185007` `Adjacent sequences: A176554 A176555 A176556 * A176558 A176559 A176560`
	KEYWORD	`nonn`
	AUTHOR	`Giovanni Teofilatto, Apr 20 2010`
	EXTENSIONS	`More terms from R. J. Mathar and Vincenzo Librandi, Apr 21 2010`
	STATUS	`approved`

License Agreements, Terms of Use, Privacy Policy. .

Last modified January 15 10:26 EST 2021. Contains 340187 sequences. (Running on oeis4.)