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Showing entries 1-10 | older changes
Numbers k such that prime(k) and prime(k) + 9 are anagrams.
(history; published version)
#26 by OEIS Server at Sun Jan 19 00:36:42 EST 2025
LINKS

Robert Israel, <a href="/A379208/b379208_1.txt">Table of n, a(n) for n = 1..10000</a>

Numbers with monotonically increasing digits, increasing by only 0 or 1.
(history; published version)
#21 by OEIS Server at Sun Jan 19 00:36:36 EST 2025
LINKS

Robert Israel, <a href="/A378949/b378949_1.txt">Table of n, a(n) for n = 1..10000</a>

Number of divisors of the absolute value of Ramanujan tau numbers. a(n) = 0 if tau(n) = 0.
(history; published version)
#29 by OEIS Server at Sun Jan 19 00:35:50 EST 2025
LINKS

Amiram Eldar, <a href="/A133202/b133202_1.txt">Table of n, a(n) for n = 1..10000</a>

a(n) = Sum_{k=1..n} k^2*tau(k), where tau is A000005.
(history; published version)
#29 by OEIS Server at Sun Jan 19 00:35:18 EST 2025
LINKS

Amiram Eldar, <a href="/A319085/b319085_1.txt">Table of n, a(n) for n = 1..10000</a>

a(n) = Sum_{k=1..n} k * tau(k)^2, where tau is A000005.
(history; published version)
#14 by OEIS Server at Sun Jan 19 00:35:12 EST 2025
LINKS

Amiram Eldar, <a href="/A320896/b320896_1.txt">Table of n, a(n) for n = 1..10000</a>

a(n) = Sum_{k=1..n} k^2 * tau(k)^2, where tau is A000005.
(history; published version)
#16 by OEIS Server at Sun Jan 19 00:35:03 EST 2025
LINKS

Amiram Eldar, <a href="/A320897/b320897_1.txt">Table of n, a(n) for n = 1..10000</a>

Prime numbers p such that the interval from p to the next prime number contains a unique perfect power.
(history; published version)
#19 by OEIS Server at Sun Jan 19 00:34:48 EST 2025
LINKS

Robert Israel, <a href="/A379154/b379154_1.txt">Table of n, a(n) for n = 1..10000</a>

Number of genus-8 rooted maps with n edges.
(history; published version)
#24 by OEIS Server at Sat Jan 18 21:58:28 EST 2025
LINKS

Andrew Howroyd, <a href="/A238358/b238358_1.txt">Table of n, a(n) for n = 16..200</a>

Number of genus-7 rooted maps with n edges.
(history; published version)
#25 by OEIS Server at Sat Jan 18 21:58:23 EST 2025
LINKS

Andrew Howroyd, <a href="/A238357/b238357_1.txt">Table of n, a(n) for n = 14..200</a>

Number of rooted maps of genus 6 containing n edges.
(history; published version)
#28 by OEIS Server at Sat Jan 18 21:58:19 EST 2025
LINKS

Andrew Howroyd, <a href="/A238356/b238356_1.txt">Table of n, a(n) for n = 12..500</a>