1,1

Union with A124588 gives A124589. - Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Dec 23 2006

R. Zumkeller, Table of n, a(n) for n = 1..1000

a(n) = A031505(n+1) - 4 = A029708(n) - 2.

79 is a term as the next prime is 79 + 4 = 83. 3 is not a term even though 3+4 = 7 is prime, since it is not the next one.

for i from 1 to 226 do if ithprime(i+1) = ithprime(i) + 4 then print({ithprime(i)}); fi; od; . - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Mar 19 2007

Essentially the same as A023200.

Cf. A001359.

Sequence in context: A048646 A098059 A078860 this_sequence A078863 A059351 A059262

Adjacent sequences: A029707 A029708 A029709 this_sequence A029711 A029712 A029713

nonn

njas