209524210

Appears in sequences

• Unitary-sociable numbers (smallest member of each cycle).at n=13A000173
• Sociable numbers: smallest member of each cycle (conjectured).at n=13A003416
• Smallest member of sociable quadruples.at n=11A090615
• Irregular triangle with 4 columns which contains in each row the members of a 4-cycle under the map x->A063919(x), iteration of summing the proper-unitary divisors.at n=12A098188
• Smallest member of sociable quadruples with signature: abundant, deficient, deficient, deficient.at n=1A222976
• Conjectured list of numbers in increasing order that belong to sociable cycles of length greater than 2 in which the sum of the cycle is divisible by 10.at n=20A292217
• Unitary sociable numbers of order 4.at n=9A319902
• Smallest member of bi-unitary sociable quadruples.at n=22A319915
• Smallest member of sociable quadruples using Dedekind psi function (A001615).at n=12A323331
• Smallest members of infinitary sociable quadruples.at n=21A361811