_Reinhard Zumkeller_, <, <a href="/A133810/b133810.txt">Table of n, a(n) for n = 1..10000</a>

OEIS Server: https://oeis.org/edit/global/1934

_Reinhard Zumkeller, <_, <a href="/A133810/b133810.txt">Table of n, a(n) for n = 1..10000</a>

OEIS Server: https://oeis.org/edit/global/1866

editing

approved

(Haskell)

a133810 n = a133810_list !! (n-1)

a133810_list = 1 : filter f [2..] where

f x = (and $ zipWith (<=) eps $ tail eps) &&

(all (== 1) $ zipWith (-) (tail ips) ips)

where ips = map a049084 $ a027748_row x

eps = a124010_row x

-- Reinhard Zumkeller, Nov 07 2012

Cf. A124010, A027748, A049084.

Reinhard Zumkeller, <a href="/A133810/b133810.txt">Table of n, a(n) for n = 1..10000</a>

approved

editing

_Olivier Gerard (olivier.gerard(AT)gmail.com), Gérard_, Sep 23, 2007

OEIS Server: https://oeis.org/edit/global/117

All numbers of the form p_1^k1*p_2^k2*...*p_n^k_n, where k1 <= k2 <= ... <= k_n, and the p_i are n successive primes.

nonn,new

nonn

nonn,new

nonn

Olivier Gerard (ogerardolivier.gerard(AT)ext.jussieugmail.frcom), Sep 23, 2007

Numbers that are primally tight and have weakly ascending powers.

1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 13, 15, 16, 17, 18, 19, 23, 25, 27, 29, 30, 31, 32, 35, 36, 37, 41, 43, 47, 49, 53, 54, 59, 61, 64, 67, 71, 73, 75, 77, 79, 81, 83, 89, 97, 101, 103, 105, 107, 108, 109, 113, 121, 125, 127, 128, 131, 137, 139, 143, 149, 150, 151, 157, 162

1,2

All numbers of the form p_1^k1*p_2^k2*...*p_n^k_n, where k1 <= k2 <= ... <= k_n, and the p_i are n successive primes.

Cf. A025487, A087980, A073491, A133808-A133813.

nonn

Olivier Gerard (ogerard(AT)ext.jussieu.fr), Sep 23, 2007

approved