nPagesPerMapPage 53889 ext/sqlite3/libsqlite/sqlite3.c   int nPagesPerMapPage;
nPagesPerMapPage 53893 ext/sqlite3/libsqlite/sqlite3.c   nPagesPerMapPage = (pBt->usableSize/5)+1;
nPagesPerMapPage 53894 ext/sqlite3/libsqlite/sqlite3.c   iPtrMap = (pgno-2)/nPagesPerMapPage;
nPagesPerMapPage 53895 ext/sqlite3/libsqlite/sqlite3.c   ret = (iPtrMap*nPagesPerMapPage) + 2;