A031505 Upper prime of a difference of 4 between consecutive primes.

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

Offset

1,1

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

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

Mathematica

Select[Partition[Prime[Range[250]], 2, 1], #[[2]]-#[[1]]==4&][[All, 2]] (* Harvey P. Dale, Feb 02 2023 *)

Crossrefs

Essentially the same as A046132.

Sequence in context: A316188 A096454 A099722 * A094524 A243817 A377174

Adjacent sequences: A031502 A031503 A031504 * A031506 A031507 A031508

Keyword

nonn

Author

Jeff Burch

Extensions

Corrected and extended by Henry Bottomley, Jul 18 2000

Definition clarified by Harvey P. Dale, Feb 02 2023

Status

approved