53225

Appears in sequences

• Number of (n+3) X 8 0..1 matrices with each 4 X 4 subblock idempotent.at n=18A224565
• Numbers whose digits are prime and which retain this property when multiplied by some 1-digit prime (i.e., one of 2, 3, 5 or 7).at n=23A227922
• Number of sets of nonempty words with a total of n letters over quinary alphabet such that within each prefix of a word every letter of the alphabet is at least as frequent as the subsequent alphabet letter.at n=11A293744
• Positions of powerful terms among the numbers satisfying Euler's condition for odd perfect numbers (A228058).at n=15A388279