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A202106 Smallest prime p such that 4n^2+p is prime. 0
3, 3, 5, 3, 3, 5, 3, 7, 7, 19, 3, 11, 7, 3, 7, 7, 7, 5, 3, 7, 13, 13, 13, 5, 3, 3, 11, 31, 7, 7, 3, 3, 7, 13, 3, 5, 3, 3, 5, 73, 13, 13, 37, 13, 11, 3, 3, 5, 19, 7, 23, 31, 3, 13, 7, 3, 5, 7, 7, 7, 3, 7, 5, 37, 3, 7, 3, 7, 7, 3, 13, 7, 3, 7, 11, 13, 3, 23, 3 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..79.

EXAMPLE

n=1: 4+3=7 prime, n=2: 16+3=19 prime,

n=3: 36+5=41 prime, n=10: 400+19=419 prime.

MATHEMATICA

Table[p=3; While[!PrimeQ[4n^2+p], p=NextPrime[p]]; p, {n, 100}]

CROSSREFS

Sequence in context: A054906 A269733 A138479 * A136019 A242017 A063714

Adjacent sequences:  A202103 A202104 A202105 * A202107 A202108 A202109

KEYWORD

nonn

AUTHOR

Zak Seidov, Dec 11 2011

STATUS

approved

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Last modified July 24 05:05 EDT 2021. Contains 346273 sequences. (Running on oeis4.)