2-nadirs of sigma: numbers k such that sigma(k-2) > sigma(k-1) > sigma(k) < sigma(k+1) < sigma(k+2).
A076774
2-nadirs of sigma: numbers k such that sigma(k-2) > sigma(k-1) > sigma(k) < sigma(k+1) < sigma(k+2).
Terms
- a(0) =17254a(1) =27754a(2) =68914a(3) =69686a(4) =82774a(5) =92366a(6) =111266a(7) =133706a(8) =152426a(9) =194426a(10) =267994a(11) =277586a(12) =359974a(13) =387694a(14) =389726a(15) =429274a(16) =448174a(17) =452726a(18) =457766a(19) =471626a(20) =474146a(21) =522026a(22) =527066a(23) =531334a(24) =554126a(25) =567386a(26) =595594a(27) =610226a(28) =674246a(29) =674974
External references
- oeis: A076774