id:A121815 - OEIS Search Results

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Least positive k such that (n*10^n+n+1)*10^n+k is prime.

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7, 23, 13, 29, 3, 7, 29, 57, 3, 43, 21, 69, 31, 9, 19, 31, 179, 21, 167, 71, 19, 13, 3, 207, 29, 89, 123, 343, 171, 73, 127, 171, 9, 329, 101, 463, 373, 9, 87, 77, 33, 661, 493, 159, 159, 89, 417, 21, 269, 381, 181, 421, 219, 183, 173, 357, 21, 13, 293, 109, 1187, 77 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Note that a(87)=87; any more where k=n?`
	EXAMPLE	`a(5)=3 because 50000600003 is prime.`
	CROSSREFS	`Sequence in context: A067959 A070411 A167224 this_sequence A025172 A115023 A009228` `Adjacent sequences: A121812 A121813 A121814 this_sequence A121816 A121817 A121818`
	KEYWORD	`nonn`
	AUTHOR	`Jason Earls (zevi_35711(AT)yahoo.com), Aug 26 2006`

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

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