A031505 - OEIS

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

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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