id:A024912 - OEIS Search Results

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Numbers n such that 10n+1 is prime.

+0
13

1, 3, 4, 6, 7, 10, 13, 15, 18, 19, 21, 24, 25, 27, 28, 31, 33, 40, 42, 43, 46, 49, 52, 54, 57, 60, 63, 64, 66, 69, 70, 75, 76, 81, 82, 88, 91, 94, 97, 99, 102, 103, 105, 106, 109, 115, 117, 118, 120, 123, 129, 130, 132, 136, 138, 145, 147, 148, 151, 153, 157, 160, 162 (list; graph; listen)

	OFFSET	`1,2`
	LINKS	`T. D. Noe, Table of n, a(n) for n=1..1000`
	FORMULA	`a(n)=(A081759(n-1)+1)/2.`
	MATHEMATICA	`Select[Range[170], PrimeQ[10# + 1] &] (Chandler)`
	CROSSREFS	`Cf. A030430, A049511, A081759.` `Sequence in context: A101299 A032387 A026313 this_sequence A108588 A064404 A047514` `Adjacent sequences: A024909 A024910 A024911 this_sequence A024913 A024914 A024915`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified September 5 19:27 EDT 2008. Contains 143485 sequences.

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