a(n), a(n+1), a(n+2), for n=5,8,11,... are respectively the numbers of representations of the integers 2^k-2, 2^k, 2^k+2, where k=(n+4)/3, by unordered sums of two odd primes not belonging to A158848.
A158857
a(n), a(n+1), a(n+2), for n=5,8,11,... are respectively the numbers of representations of the integers 2^k-2, 2^k, 2^k+2, where k=(n+4)/3, by unordered sums of two odd primes not belonging to A158848.
Terms
- a(0) =7a(1) =0a(2) =7a(3) =7a(4) =0a(5) =8a(6) =20a(7) =0a(8) =9a(9) =10a(10) =0a(11) =23a(12) =50a(13) =0a(14) =28a(15) =42a(16) =0a(17) =69a(18) =201a(19) =0a(20) =79a(21) =93a(22) =0a(23) =216a(24) =399a(25) =0a(26) =278a(27) =445a(28) =0a(29) =684
External references
- oeis: A158857