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A173269 2*prime(prime(n))-3 and 3*prime(prime(n))-2 are both primes. 1
1, 2, 3, 8, 11, 14, 15, 19, 23, 24, 28, 39, 44, 47, 54, 62, 63, 81, 85, 101, 121, 122, 124, 136, 152, 159, 180, 218, 219, 241, 247, 253, 274, 290, 298, 307, 323, 324, 341, 361, 371, 376, 381, 403, 410, 413, 441, 443, 479, 487, 499, 552, 554, 556, 562, 582, 622 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..57.

EXAMPLE

a(1)=1 because 2*p(p(1))-3=2*p(2)-3=2*3-3=3=prime and 3*p(p(1))-2=7=prime; a(2)=2 because 2*p(p(2))-3=2*p(3)-3=2*5-3=7=prime and 3*p(p(2))-2=13=prime; a(3)=3 because 2*p(p(3))-3=2*p(5)-3=2*11-3=19=prime and 3*p(p(3))-2=31=prime; a(4)=8 because 2*p(p(8))-3=2*p(19)-3=2*67-3=131=prime and 3*p(p(8))-2=199=prime.

CROSSREFS

Cf. A063908, A088878.

Sequence in context: A084917 A134713 A293910 * A050557 A039000 A059671

Adjacent sequences: A173266 A173267 A173268 * A173270 A173271 A173272

KEYWORD

nonn

AUTHOR

Juri-Stepan Gerasimov, Feb 14 2010

EXTENSIONS

Inserted 23 and 24, removed 34, extended the sequence - R. J. Mathar, Mar 01 2010

STATUS

approved

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Last modified November 26 14:22 EST 2022. Contains 358362 sequences. (Running on oeis4.)