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A070156 n-1,n+1,1+n^2 and 1+n^4 are all prime numbers. 3
4, 6, 180, 3390, 18060, 19380, 34500, 92220, 92640, 96180, 114660, 127680, 133980, 140760, 159630, 161880, 172170, 207480, 254280, 255840, 263820, 296910, 309780, 378570, 380880, 397590, 408690, 422880, 432660, 440550, 511170, 540390, 572940 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..32.

EXAMPLE

n=6: 5,7,37,1297 are all primes

MATHEMATICA

Do[s=n; If[PrimeQ[n-1]&&PrimeQ[n+1]&&PrimeQ[1+n^2] &&PrimeQ[1+n^4], Print[n]], {n, 1, 1000000}]

CROSSREFS

Cf. A001359, A070155.

Sequence in context: A197882 A074124 A303161 * A298147 A081970 A076098

Adjacent sequences:  A070153 A070154 A070155 * A070157 A070158 A070159

KEYWORD

easy,nonn

AUTHOR

Labos Elemer, Apr 23 2002

STATUS

approved

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Last modified December 9 08:41 EST 2021. Contains 349627 sequences. (Running on oeis4.)