Smaller of two consecutive primes p and q, both ending with 9, such that q - p = 10*n, or -1 if no such primes exist.

A381511

Smaller of two consecutive primes p and q, both ending with 9, such that q - p = 10*n, or -1 if no such primes exist.

Terms

    a(0) =139a(1) =3089a(2) =5749a(3) =20809a(4) =60539a(5) =110359a(6) =173359a(7) =618719a(8) =1294849a(9) =838249a(10) =6877109a(11) =1895359a(12) =11188759a(13) =7621259a(14) =35560009a(15) =33803689a(16) =124956059a(17) =92801029a(18) =142414669a(19) =378043979a(20) =229316459a(21) =390932389a(22) =1095750599a(23) =995151679a(24) =2174082649a(25) =2603726969a(26) =3402493709a(27) =1997191249

External references