Concatenation of 'nextprime(k) and k and prevprime(k)' is a prime.

Terms

a(0) =8a(1) =23a(2) =32a(3) =36a(4) =44a(5) =54a(6) =66a(7) =74a(8) =77a(9) =84a(10) =91a(11) =104a(12) =113a(13) =115a(14) =122a(15) =130a(16) =132a(17) =162a(18) =174a(19) =178a(20) =187a(21) =188a(22) =191a(23) =204a(24) =212a(25) =222a(26) =224a(27) =232a(28) =235a(29) =259