A320880 Primes such that iteration of A062028 (n + its digit sum) yields 8 primes in a row.

56676324799, 373169411809, 2121959132809, 10180781225809, 14328311692789, 17429111275789, 32594135422789, 34327062247789, 39262151325799, 57404320087789, 60760513291789, 63116080460809, 66105224572789, 92054642332789, 98606700040789

Offset

1,1

Comments

Term a(1) is immediate to find from the nearly equal terms A320879(7..8); terms a(2..9) were found by G. Resta as answer to Rivera's Puzzle 163, cf. link.

Links

Table of n, a(n) for n=1..15.

Carlos Rivera, Puzzle 163. P+SOD(P)

Formula

A320880 = { n in A320879 | A062028(n) in A320879 }.

Prog

(PARI) is_A320880(n)=isprime(n=A062028(n))&& is_A320879(n)

Crossrefs

Cf. A047791, A048519, A062028 (n + digit sum of n).

Cf. A048523 .. A048527.

Subsequence of A320879 which is subsequence of A320878.

a(1) = A090009(9) = start of first chain of 9 primes under iteration of A062028.

Sequence in context: A344196 A346365 A295042 * A015401 A273930 A273931

Adjacent sequences: A320877 A320878 A320879 * A320881 A320882 A320883

Keyword

nonn,base

Author

Zak Seidov and M. F. Hasler, Nov 08 2018

Extensions

a(10)-a(15) from Lars Blomberg, Feb 10 2019

Status

approved