29403

Appears in sequences

• Numbers of the form 3^i*11^j.at n=27A003597
• a(n) = 3^n*(3^n-1)/2.at n=5A026121
• Number of reversible strings with n beads of 3 colors. If more than 1 bead, not palindromic.at n=9A032086
• Numerators of continued fraction convergents to sqrt(261).at n=7A041488
• Odd numbers divisible by exactly 7 primes (counted with multiplicity).at n=31A046320
• Numbers n such that A048767(n) = n.at n=31A048768
• Number of primitive (aperiodic) palindromic structures using a maximum of three different symbols.at n=22A056477
• Numbers k such that k | 11^k + 10^k + 9^k + 8^k + 7^k + 6^k + 5^k + 4^k + 3^k + 2^k + 1^k.at n=41A057292
• A list of equal temperaments (equal divisions of the octave) whose nearest scale steps are closer and closer approximations to the ratios of three complementary pairs of simple musical tones: 7/6 and 12/7, 6/5 and 5/3 and 7/5 and 10/7.at n=36A060529
• The prime factors of n are also prime factors of the decimal encoding (A067599) of the prime factorization of n.at n=32A067671
• Composite numbers k+1 such that k*phi(k+1) is a perfect square.at n=26A069068
• Numbers n such that A001414(n) = sum of composites from the smallest prime factor of n to the largest prime factor of n.at n=14A074053
• Triangular numbers which are 7-almost primes.at n=14A076581
• Smallest triangular number having n^2 as divisor.at n=32A080983
• Triangular numbers whose sum of aliquot divisors is a prime number.at n=19A083676
• Triangular numbers > 0 with a prime signature that has not occurred earlier.at n=27A085076
• Numbers k for which the quotient q(k)=(k+rev(k))/abs(k-rev(k)) is an integer.at n=15A087993
• Triangular numbers with palindromic indices.at n=33A089717
• Numbers n such that (n+j) mod (2+j) = 1 for j from 0 to 6 and (n+7) mod 9 <> 1.at n=23A096025
• Concatenation of triangular number k and its 10's complement is prime.at n=17A108970