A115972 a(n) = least prime P(n) such that P(n)-2*p(n) is prime and P(n+1)>P(n) with p(n)=n-th prime.

11, 29, 149, 307, 1151, 2503, 8501, 30631, 81509, 85991, 190471, 404671, 535481, 840439, 1101071, 2127269, 4640717, 6613753, 6958801, 10343903, 24120379, 49269739, 83751287, 101649827, 166726561, 273469943, 310845889

Offset

1,1

Links

Table of n, a(n) for n=1..27.

Example

p(1)=2, 11-2*p(1)=7 prime so a(1)=11

Crossrefs

Sequence in context: A168171 A249993 A080083 * A099109 A352432 A302091

Adjacent sequences: A115969 A115970 A115971 * A115973 A115974 A115975

Keyword

nonn

Author

Pierre CAMI, Mar 14 2006

Status

approved