id:A064281 - OEIS Search Results

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Least k such that k*10^n+1, k*10^n+3, k*10^n+7 and k*10^n+9 are all prime.

+0
3

4, 1, 1, 13, 676, 283, 14311, 12022, 27346, 14965, 3427, 100942, 12370, 1237, 3274, 42382, 18619, 4570, 457, 434869, 203362, 305491, 213742, 436831, 217198, 168586, 258214, 215737, 1312441, 272848, 744082, 2059111, 351055, 712333, 1880302 (list; graph; listen)

	OFFSET	`0,1`
	MATHEMATICA	`Do[k = 1; While[ !PrimeQ[k10^n + 1] \|\| !PrimeQ[k10^n + 3] \|\| !PrimeQ[k10^n + 7] \|\| !PrimeQ[k10^n + 9], k++ ]; Print[k], {n, 0, 20} ]`
	CROSSREFS	`Sequence in context: A157153 A147565 A022167 this_sequence A050154 A058711 A157013` `Adjacent sequences: A064278 A064279 A064280 this_sequence A064282 A064283 A064284`
	KEYWORD	`nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Oct 14 2001`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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