#number

New Issue: Regional Science Policy & Practice Regional Science Policy & Practice Volume 18, Issue 7, July 2026 Articles Re-bordering Schengen? Explaining the spatial patterns of border control measures Article Number 100315 Tobias Chilla, Dominik Ber

In Pascal’s triangle, each number is the sum of the two above it. Obviously, the infinite pyramid contains an infinite number of 1s, but most numbers appear surprisingly seldom: 2 appears just once. 3, 4, 5, and all odd primes appear exactly twice. 6

New Issue: Papers in Regional Science New issue available on ScienceDirect Papers in Regional Science Volume 105, Issue 3, June 2026 Articles The geography of the green transition: Performance, vulnerabilities and opportunities Article Number 100150

New Issue: Regional Science Policy & Practice Regional Science Policy & Practice Volume 18, Issue 6, June 2026 Articles One instrument, two goals: Using taxation to achieve efficiency and rent capture in fisheries management Article Number 100301 Nil