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A248887 Primes p of the form 4m^2+1 such that q=4p^2+1 and r=4q^2+1 are prime. 1
677, 6635777, 28132417, 156400037, 234518597, 381655297, 386751557, 403849217, 820020497, 1215498497, 1298449157, 1539463697, 1580539537, 1839037457, 2072616677, 2774550277, 2969814017, 6147500837, 6194319617, 6703351877, 6937890437 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

All terms == 7 mod 10. Subsequence of A121834.

LINKS

Table of n, a(n) for n=1..21.

CROSSREFS

Cf. A001912, A121326.

Sequence in context: A205471 A144381 A097773 * A031524 A158385 A251836

Adjacent sequences: A248884 A248885 A248886 * A248888 A248889 A248890

KEYWORD

nonn

AUTHOR

Zak Seidov, Mar 05 2015

STATUS

approved

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Last modified January 29 00:02 EST 2023. Contains 359905 sequences. (Running on oeis4.)