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A034596 a(n) preceded and followed by nextprime(a(n)) is a prime. 5
5, 11, 12, 13, 15, 16, 19, 29, 30, 42, 43, 45, 46, 75, 88, 89, 97, 103, 113, 117, 125, 126, 137, 149, 150, 162, 163, 174, 198, 200, 225, 237, 252, 258, 267, 268, 273, 276, 280, 286, 323, 329, 330, 339, 346, 351, 359, 366, 374, 382, 387, 392, 393, 400, 407, 412 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,1
LINKS
EXAMPLE
a(n)=323 -> nextprime(a(n)) is 331 so '331323331' is prime.
CROSSREFS
See also A034591-A034595.
Sequence in context: A126243 A095805 A244534 * A166275 A122955 A030318
KEYWORD
nonn,base
AUTHOR
Patrick De Geest, Oct 15 1998
STATUS
approved

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Last modified May 26 04:31 EDT 2024. Contains 372807 sequences. (Running on oeis4.)