214183

Appears in sequences

• Irregular table read by rows: n-th row lists the 9 n-gonal numbers of a 3 X 3 semimagic square with the smallest magic sum. The terms of each row are arranged in the manner shown in A261816.at n=43A265141
• Heptagonal numbers (A000566) in which parity of digits alternates.at n=26A297646
• a(n) is the smallest k such that the sum of the first k primes has exactly n prime factors, counting multiplicity.at n=20A385997