125137

Appears in sequences

• Number of (n+6)X9 0..1 matrices with each 7X7 subblock idempotent.at n=14A224583
• a(n) = n^2*(3*n^2 - 1)/2.at n=17A260810
• Numbers k such that 2^psi(k) == -1 (mod k) where psi(k) = A001615(k).at n=12A291164
• The first of two consecutive pentagonal numbers the sum of which is equal to the sum of two consecutive primes.at n=7A298463