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A052291 Primes p such that 4p^2 + 1 is also prime. 9
2, 3, 5, 7, 13, 37, 47, 67, 73, 103, 157, 163, 193, 233, 317, 337, 547, 587, 647, 653, 677, 683, 773, 827, 883, 887, 947, 983, 1013, 1063, 1087, 1163, 1297, 1327, 1373, 1487, 1493, 1523, 1553, 1567, 1607, 1627, 1637, 1657, 1663, 1667, 1723, 1867, 1873 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

LINKS

T. D. Noe, Table of n, a(n) for n=1..5000

Marek Wolf, Search for primes of the form m^2+1

EXAMPLE

the 5th term is 13 and 4*169+1 = 677 is also a prime

CROSSREFS

Cf. A052292.

Sequence in context: A140768 A192578 A050779 * A072826 A084761 A038965

Adjacent sequences:  A052288 A052289 A052290 * A052292 A052293 A052294

KEYWORD

nonn

AUTHOR

Labos E. (labos(AT)ana.sote.hu), Feb 08 2000

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Last modified February 15 13:31 EST 2012. Contains 205802 sequences.