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A145743 a(n) is the smallest composite number m such that all n numbers m+4*k^2 for k=1,2,...,n are prime. 2
9, 15, 25, 25, 247, 583, 5377, 143473, 143473, 143473, 2821813, 62087033647, 91450844347 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

There is no further term up to 5*10^8.

LINKS

Table of n, a(n) for n=1..13.

CROSSREFS

Cf. A145741, A145742.

Sequence in context: A274288 A172292 A075638 * A164384 A138193 A330947

Adjacent sequences:  A145740 A145741 A145742 * A145744 A145745 A145746

KEYWORD

more,nonn

AUTHOR

Farideh Firoozbakht, Oct 17 2008

EXTENSIONS

a(12)-a(13) from Donovan Johnson, Nov 17 2008

STATUS

approved

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Last modified July 30 04:51 EDT 2021. Contains 346348 sequences. (Running on oeis4.)