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A082910
a(n) = prime(prime(n+1)-prime(n)).
1
2, 3, 3, 7, 3, 7, 3, 7, 13, 3, 13, 7, 3, 7, 13, 13, 3, 13, 7, 3, 13, 7, 13, 19, 7, 3, 7, 3, 7, 43, 7, 13, 3, 29, 3, 13, 13, 7, 13, 13, 3, 29, 3, 7, 3, 37, 37, 7, 3, 7, 13, 3, 29, 13, 13, 13, 3, 13, 7, 3, 29, 43, 7, 3, 7, 43, 13, 29, 3, 7, 13, 19, 13, 13, 7, 13, 19, 7, 19, 29, 3, 29, 3, 13, 7, 13
OFFSET
1,1
COMMENTS
Except for a(1) = 2, only primes of even subscript (i.e. members of A031215) occur.
FORMULA
a(n) = A000040(A001223(n)).
MAPLE
seq(ithprime(ithprime(n+1)-ithprime(n)), n=1..100); # Robert Israel, Feb 12 2015
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Labos Elemer, Apr 23 2003
EXTENSIONS
Comment corrected by Robert Israel, Feb 12 2015
STATUS
approved