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A031505 Upper prime of a difference of 4 between primes. 8
11, 17, 23, 41, 47, 71, 83, 101, 107, 113, 131, 167, 197, 227, 233, 281, 311, 317, 353, 383, 401, 443, 461, 467, 491, 503, 617, 647, 677, 743, 761, 773, 827, 857, 863, 881, 887, 911, 941, 971, 1013, 1091, 1097, 1217, 1283, 1301, 1307, 1427, 1433, 1451 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..50.

FORMULA

a(n) = A029710(n-1) + 4 = A029708(n) + 2.

MAPLE

for i from 1 to 232 do if ithprime(i+1) = ithprime(i) + 4 then print({ithprime(i+1)}); fi; od; # Zerinvary Lajos, Mar 19 2007

CROSSREFS

Essentially the same as A046132.

Sequence in context: A316188 A096454 A099722 * A094524 A243817 A098412

Adjacent sequences:  A031502 A031503 A031504 * A031506 A031507 A031508

KEYWORD

nonn

AUTHOR

Jeff Burch

EXTENSIONS

Corrected and extended by Henry Bottomley, Jul 18 2000

STATUS

approved

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Last modified January 17 18:14 EST 2020. Contains 330987 sequences. (Running on oeis4.)