OFFSET
1,1
COMMENTS
LINKS
Hugo Pfoertner, Table of n, a(n) for n = 1..38 (all terms)
Shyam Sunder Gupta, The largest right-truncatable semiprime, Prime Curios.
EXAMPLE
a(1) = 9 = 3*3
a(2) = 95 = 5*19 and none of 96, 97, 98, 99 semiprime
a(3) = 959 = 7*137
a(4) = 9599 = 29*331
a(5) = 95999 = 17*5647
a(6) = 959999 = 643*1493
a(7) = 9599999 = 1019*9421
a(8) = 95999987 = 7349*13063, 9599998 = 2*4799999 and none of 95999988 ... 95999999 semiprime
CROSSREFS
KEYWORD
nonn,base,fini,full
AUTHOR
Hugo Pfoertner, Jun 27 2012
STATUS
approved