55518

Appears in sequences

• Indices of centered octagonal numbers (A016754) which are also heptagonal numbers (A000566).at n=5A253920
• Wiener index of graph of b.c.c. unit cells in a line = Sum of distances in a b.c.c. row graph.at n=17A273321
• Numbers k such that all primes dividing the k-th composite number divide k as well.at n=45A368309