Smaller of two consecutive primes p and q, both ending with 7, such that q - p = 10n, or -1 if no such primes exist.

A381510

Smaller of two consecutive primes p and q, both ending with 7, such that q - p = 10n, or -1 if no such primes exist.

Terms

    a(0) =337a(1) =887a(2) =4297a(3) =33247a(4) =31907a(5) =124367a(6) =218287a(7) =1122287a(8) =1964987a(9) =1313467a(10) =1468277a(11) =7160227a(12) =5518687a(13) =16525757a(14) =13626257a(15) =71880637a(16) =27915737a(17) =17051707a(18) =394059907a(19) =566348087a(20) =252314747a(21) =472865287a(22) =1289694257a(23) =633418787a(24) =1588640437a(25) =944192807a(26) =1391048047a(27) =7059848287

External references