A285690 - OEIS

A285690

a(1) = 2; a(n + 1) = smallest prime > a(n) such that a(n + 1) - a(n) is the product of five primes.

2, 569, 601, 673, 853, 1021, 1069, 1117, 1229, 1277, 1439, 1471, 1543, 1663, 1783, 1831, 1879, 1951, 1999, 2111, 2143, 2251, 2371, 2539, 2647, 2719, 2767, 2879, 2927, 2999, 3079, 3187, 3259, 3307, 3469, 3517, 3637, 3709, 3821, 3853, 4021, 4093, 4201

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OFFSET

1,1

COMMENTS

First differences: 567, 32, 72, 180, 168, 48, 48, 112, 48, 162, 32, 72, 120, 120, 48, 48, 72, 48, 112, 32, ...

LINKS

Robert Israel, Table of n, a(n) for n = 1..10000

MAPLE

A[1]:= 2:

for n from 2 to 100 do

p:= A[n-1];

p:= nextprime(p);

if numtheory:-bigomega(p-A[n-1])=5 then A[n]:= p; break fi

od od:

seq(A[i], i=1..100); # Robert Israel, Nov 04 2019

MATHEMATICA

NestList[Module[{p = NextPrime@ #}, While[PrimeOmega[p - #] != 5, p = NextPrime@ p]; p] &, 2, 40] (* Michael De Vlieger, Apr 25 2017 *)

CROSSREFS

Cf. A255609, A285688, A285689.

Sequence in context: A201247 A265633 A117509 * A201603 A200964 A243479

Adjacent sequences: A285687 A285688 A285689 * A285691 A285692 A285693

KEYWORD

nonn

AUTHOR

Zak Seidov, Apr 24 2017

STATUS

approved