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A173959 List of primes p1 and p2 such that 3*p1 - 2 = 2*p2 - 3 is nonprime. 0
19, 29, 31, 47, 59, 89, 131, 197, 151, 227, 179, 269, 239, 359, 311, 467, 379, 569, 439, 659, 479, 719, 547, 821, 571, 857, 607, 911, 619, 929, 631, 947, 647, 971, 739, 1109, 787, 1181, 811, 1217, 839, 1259, 859, 1289, 967, 1451, 1039, 1559, 1259, 1889, 1319 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..51.

EXAMPLE

a(1)=19, a(2)=29 because 3*19 - 2 = 2*29 - 3 = 55.

MAPLE

for i from 1 to 400 do p :=ithprime(i) ; q := (3*p+1)/2 ; if type(q, 'integer') then if isprime(q) then if not isprime(3*p-2) then printf("%d, %d, ", p, q) ; end if; end if; end if; end do: # R. J. Mathar, Mar 29 2010

CROSSREFS

Cf. A000040, A141468.

Sequence in context: A052260 A067833 A135170 * A139539 A191047 A047985

Adjacent sequences:  A173956 A173957 A173958 * A173960 A173961 A173962

KEYWORD

nonn

AUTHOR

Juri-Stepan Gerasimov, Mar 03 2010

EXTENSIONS

Corrected and extended by R. J. Mathar, Mar 29 2010

STATUS

approved

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Last modified November 15 21:37 EST 2019. Contains 329168 sequences. (Running on oeis4.)