OFFSET
1,4
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..47
FORMULA
EXAMPLE
a(1) = 0 since 2 is adjacent to 3 (exponent of 2nd Mersenne prime).
a(2) = 1 since 4 is between 3 and 5 (exponent of 3rd Mersenne prime).
a(3) = 1 since 6 is between 5 and 7 (exponent of 4th Mersenne prime).
a(4) = 4 since 8, 9, 10, and 12 are between 7 and 13 (exponent of 5th Mersenne prime).
MATHEMATICA
mp={ (*A000043 *) }; lst = {}; Do[ c = mp[[n + 1]] - mp[[n]] - PrimePi@ mp[[n + 1]] + PrimePi@ mp[[n]]; AppendTo[lst, c], {n, 38}]; lst (* Robert G. Wilson v, Mar 14 2009 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Jani Melik, Mar 08 2009, Apr 02 2009
EXTENSIONS
a(34)-a(38) from Robert G. Wilson v, Mar 14 2009
a(39)-a(44) from Amiram Eldar, Oct 17 2024
STATUS
approved