A348178 -id:A348178 - cp's OEIS frontend

A085237 Nondecreasing gaps between primes.

1, 2, 2, 4, 4, 4, 6, 6, 6, 6, 6, 6, 6, 8, 14, 14, 14, 18, 20, 22, 34, 34, 36, 36, 36, 44, 52, 52, 72, 86, 86, 96, 112, 114, 118, 132, 132, 148, 154, 154, 154, 180, 210, 220, 222, 234, 248, 250, 250, 282, 288, 292, 320, 336, 336, 354, 382, 384, 394, 456, 464, 468, 474, 486, 490, 500, 514, 516, 532, 534, 540, 582, 588, 602, 652, 674, 716, 766, 778

Offset: 1

Farideh Firoozbakht, Aug 11 2003

nonn

All terms of A005250 are in the sequence, but some terms of A005250 appear in this sequence more than once.

a(n) is the gap between the n-th and (n+1)-th sublists of prime numbers defined in A348178. - Ya-Ping Lu, Oct 19 2021

			a(21) = a(22) = 34 because prime(218) - prime(217) = prime(1060) - prime(1059) = 34 and prime(n+1) - prime(n) is less than 34, for n < 1059 and n not equal to 217.

R. K. Guy, Unsolved problems in number theory.

Cf. A005250, A005669, A053686, A002386, A348178.

f[n_] := Prime[n+1]-Prime[n]; v={}; Do[ If[f[n]>=If[n==1, 1, v[[ -1]]], v1=n; v=Append[v, f[v1]]; Print[v]], {n, 105000000}]
DeleteDuplicates[Differences[Prime[Range[10^7]]],Greater] (* Harvey P. Dale, Jan 17 2024 *)

from sympy import nextprime; p, r = 2, 0
while r < 778:
    q = nextprime(p); g = q - p
    if g >= r: print(g, end = ', '); r = g
    p = q # Ya-Ping Lu, Jan 23 2024

a(53)-a(63) from Donovan Johnson, Nov 24 2008
a(64)-a(76) from Charles R Greathouse IV, May 09 2011
a(77)-a(79) from Charles R Greathouse IV, May 19 2011

A134266 Primes associated with the prime gaps listed in A085237.

Original entry on oeis.org

2, 3, 5, 7, 13, 19, 23, 31, 47, 53, 61, 73, 83, 89, 113, 293, 317, 523, 887, 1129, 1327, 8467, 9551, 12853, 14107, 15683, 19609, 25471, 31397, 155921, 338033, 360653, 370261, 492113, 1349533, 1357201, 1561919, 2010733, 4652353, 11113933, 15203977, 17051707, 20831323, 47326693, 122164747, 189695659, 191912783

Offset: 1

David W. Wilson, Dec 31 2007

nonn

The smallest prime p(n) such that p(n+1)-p(n) is nondecreasing. The smallest prime p(n) such that (p(n+1)/p(n))^p(n) is increasing. [Thomas Ordowski, May 26 2012]

a(n) is the last prime in the n-th sublist of prime numbers defined in A348178. - Ya-Ping Lu, Oct 19 2021

Michel Planat and Patrick Solé, Improving Riemann prime counting, arXiv preprint arXiv:1410.1083 [math.NT], 2014.

See also A205827(n) = A000040(A214935(n)), A182514(n) = A000040(A241540(n)).

Cf. A348178.

from sympy import nextprime; p, r = 2, 0
while p < 2*10**8:
    q = nextprime(p); g = q - p
    if g >= r: print(p, end = ', '); r = g
    p = q # Ya-Ping Lu, Jan 23 2024

a(n) = A000040(A085500(n)). - M. F. Hasler, Apr 26 2014

A361823 a(1) = 3; thereafter, a(n+1) is the smallest prime p such that p - prevprime(p) >= a(n) - prevprime(a(n)).

Original entry on oeis.org

3, 5, 7, 11, 17, 23, 29, 37, 53, 59, 67, 79, 89, 97, 127, 307, 331, 541, 907, 1151, 1361, 8501, 9587, 12889, 14143, 15727, 19661, 25523, 31469, 156007, 338119, 360749, 370373, 492227, 1349651, 1357333, 1562051, 2010881, 4652507, 11114087, 15204131, 17051887

Offset: 1

Ya-Ping Lu, Mar 25 2023

nonn

a(n) is the leading prime in the (n+1)-th prime sublist defined in A348178.

Cf. A001223, A070866, A134266, A348178.

a361823(upto) = {my(pp=2, gap=1); forprime (p=3, upto, my(g=p-pp);if(g>=gap, print1(p,", "); gap=g); pp=p)};
a361823(20000000) \\ Hugo Pfoertner, Apr 03 2023

from sympy import nextprime; q = 2; g = 0
while q < 20000000:
    p = nextprime(q); d = p - q
    if d >= g: print(p, end = ', '); g = d
    q = p

a(n) = nextprime(A134266(n)). - Michel Marcus, Mar 30 2023

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A085237 Nondecreasing gaps between primes.

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A134266 Primes associated with the prime gaps listed in A085237.

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A361823 a(1) = 3; thereafter, a(n+1) is the smallest prime p such that p - prevprime(p) >= a(n) - prevprime(a(n)).

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