29261

Appears in sequences

• Crystal ball sequence for hyperbolic tessellation 3^7 (from triangle group (2,3,7)).at n=9A001360
• a(n) is the concatenation of n and 9n.at n=28A009474
• Numbers k such that replacing each digit d in the decimal expansion of k with d^3 yields a prime each time, when done recursively three times.at n=15A316982
• a(n) is the number of column convex polyiamonds with n cells.at n=11A319323
• Number T(n,k) of entries in the k-th cycles of all permutations of [n] when cycles are ordered by increasing lengths (and increasing smallest elements); triangle T(n,k), n>=1, 1<=k<=n, read by rows.at n=31A322383
• Number of entries in the fourth cycles of all permutations of [n] when cycles are ordered by increasing lengths.at n=4A332908
• Centered 10-gonal numbers which are products of two primes.at n=32A367792
• Squarefree terms of A129802 whose prime factors are neither elite (A102742) nor anti-elite (A128852), where A129802 is the possible bases for Pepin's primality test for Fermat numbers.at n=8A372895