72360

Appears in sequences

• Numbers k such that 129*2^k-1 is prime.at n=46A050590
• a(n) = AR(n) is the total number of aperiodic k-reverses of n.at n=23A180322
• G.f. satisfies: A(x - A(x) + A(x)^2) = -x^4.at n=11A291189
• Numbers of the form p^2 - 1 where p is a prime of the form 3*k-1 (A003627).at n=30A301812
• Numbers sandwiched between two semiprimes, one of which is a square.at n=39A358686
• Split A377091 into sublists consisting of runs of terms with the same sign. Sequence gives k's such that A377091(k) is the first term of those sublists whose terms (in absolute value) form an arithmetic progression with common difference -1.at n=38A380504