id:A117738 - OEIS Search Results

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Least number d such that 10^n -/+ 3d form a prime pair.

+0
2

1, 1, 3, 23, 43, 13, 87, 71, 153, 11, 19, 13, 89, 219, 119, 459, 1, 129, 633, 131, 71, 217, 1091, 911, 1141, 511, 143, 201, 377, 379, 371, 377, 83, 201, 993, 53, 143, 307, 423, 919, 259, 263, 759, 3933, 3, 1781, 607, 2327, 7683, 541, 3443, 6507, 4023, 3399, 899 (list; graph; listen)

	OFFSET	`1,3`
	FORMULA	`A115564(n)/3.`
	MATHEMATICA	`f[n_] := Block[{k = 1}, While[ ! PrimeQ[10^n - 3k] \|\| ! PrimeQ[10^n + 3k], k++ ]; k]; Array[f, 55]`
	CROSSREFS	`Sequence in context: A106892 A116893 A106066 this_sequence A014582 A146142 A105854` `Adjacent sequences: A117735 A117736 A117737 this_sequence A117739 A117740 A117741`
	KEYWORD	`nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Apr 12 2006`

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Last modified November 18 20:14 EST 2008. Contains 147244 sequences.

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