Index of Mersenne number A000225 that is also Mersenne prime A000668, minus n-th prime: a(n) = A000043(n) - A000040(n).
A153801
Index of Mersenne number A000225 that is also Mersenne prime A000668, minus n-th prime: a(n) = A000043(n) - A000040(n).
Terms
- a(0) =0a(1) =0a(2) =0a(3) =0a(4) =2a(5) =4a(6) =2a(7) =12a(8) =38a(9) =60a(10) =76a(11) =90a(12) =480a(13) =564a(14) =1232a(15) =2150a(16) =2222a(17) =3156a(18) =4186a(19) =4352a(20) =9616a(21) =9862a(22) =11130a(23) =19848a(24) =21604a(25) =23108a(26) =44394a(27) =86136a(28) =110394a(29) =131936
External references
- oeis: A153801