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A309334 Lucky prime gaps: differences between consecutive lucky primes. 3
4, 6, 18, 6, 6, 24, 6, 6, 48, 24, 12, 30, 18, 12, 18, 42, 24, 24, 18, 18, 42, 12, 12, 30, 24, 54, 36, 24, 12, 6, 12, 12, 30, 54, 12, 30, 18, 36, 60, 54, 54, 6, 12, 12, 18, 48, 6, 24, 6, 78, 30, 18, 42, 12, 156, 12, 72, 24, 12, 18, 66, 30, 30, 54, 24, 30, 48, 54 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Since (except for 3) all lucky primes == 1 (mod 6), a(n) >= 6 for n >= 2. - Robert Israel, Jul 26 2019
LINKS
FORMULA
a(n) = A031157(n+1) - A031157(n).
EXAMPLE
a(1) = 4 because difference between the first (3) and second (7) lucky prime is 4.
a(2) = 6 because difference between 7 and 13 is 6.
MAPLE
N:= 10^4: # for lucky primes up to 2*N+1
L:= [seq(2*i+1, i=0..N)]:
for n from 2 while n < nops(L) do
r:= L[n];
L:= subsop(seq(r*i=NULL, i=1..nops(L)/r), L);
od:
LP:= select(isprime, L):
LP[2..-1]-LP[1..-2]; # Robert Israel, Jul 26 2019
PROG
(SageMath)
[A031157[i+1]-A031157[i] for i in range(100)]
CROSSREFS
Sequence in context: A061361 A332986 A113610 * A263319 A062046 A102020
KEYWORD
nonn
AUTHOR
Hauke Löffler, Jul 24 2019
STATUS
approved

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Last modified February 29 20:48 EST 2024. Contains 370428 sequences. (Running on oeis4.)