20203

Appears in sequences

• Sum of 10 positive 9th powers.at n=12A003399
• n written in fractional base 4/2.at n=43A024630
• Number of partitions of n into parts not of the form 9k, 9k+4 or 9k-4. Also number of partitions with at most 3 parts of size 1 and differences between parts at distance 3 are greater than 1.at n=48A035943
• A list of equal temperaments (equal divisions of the octave) whose nearest scale steps are closer and closer approximations to six complementary pairs of ratios which generate simple musical tones (scale steps): 8/7 and 7/4, 6/5 and 5/3, 16/13 and 13/8, 5/4 and 8/5, 4/3 and 3/2 and 11/8 and 16/11.at n=48A060233
• 4-Smith numbers.at n=19A103125
• Equal divisions of the octave of decreasing thirteen-limit Pepper ambiguity.at n=18A117558
• Equal divisions of the octave of decreasing fifteen-limit Pepper ambiguity.at n=16A117559
• a(n) = 15*n^2 - 9*n + 1.at n=37A134154
• Squares in lunar arithmetic in base 4 written in base 4.at n=35A171460
• Base 2i representation of nonnegative integers.at n=27A212494
• Numbers that require three steps to collapse to a single digit in base 4 (written in base 4).at n=11A253953
• Composites in base 10 that remain composite in exactly four bases b, 2 <= b <= 10, expansions interpreted as decimal numbers.at n=11A256354
• Numbers whose septenary, octal and nonary representations are prime when read in decimal.at n=21A281252
• Prime time numbers on 6-digit clocks: numbers of the form HMMSS where H, MM, SS are primes, H < 24, MM and SS < 60.at n=1A295014
• Numbers k that are the representation of primes in base 4 and in base 5.at n=24A359840