19978

Appears in sequences

• Molien series for alternating group Alt_12 (or A_12).at n=39A008635
• Number of partitions of n into at most 12 parts.at n=39A008641
• Numbers k such that k!!!! - 1 is prime.at n=26A085147
• Number of kites on an n X n grid (or geoboard).at n=10A189417
• Number of partitions of 3n in which every part is <n.at n=12A209817
• Consider the 10's complements mod 10 of the digits of a number k. Take their sum and repeat the process deleting the first addend and adding the previous sum. The sequence lists the numbers that after some iterations reach a sum equal to k.at n=13A263534
• Values of n such that prime(n) does not divide any 10-digit pandigital number (i.e. any value in A050278).at n=4A292703
• Numbers k such that A090086(k), the smallest pseudoprime to base k (not necessarily exceeding k), is a Carmichael number.at n=31A293203
• a(n) is the number of vertices formed by n-secting the angles of a heptagon.at n=42A335758