A218455 First of a run of 6 consecutive numbers with same prime signature.

380480345, 2713001274, 6282718946, 7209536449, 9809067073, 10684724346, 12008728850, 14824913049, 17231547073, 17552118546, 17659180314, 18036555273, 20473171322, 21507097001, 23676804346, 24742649321, 25401767522, 25694056449, 27656894273, 28259097818

Offset

1,1

Comments

A number n is in this sequence iff n and n+1 is in A218448; see the comment there for other characterizations in terms of membership in A175590 or A052214 or A052213.

Links

Donovan Johnson, Table of n, a(n) for n = 1..1000

Prog

(PARI) is_A218455(n)={my(s(n)=vecsort(factor(n)[, 2]), t=s(n)); !for(m=n+1, n+5, t!=s(m) & return)}

Crossrefs

Cf. A034173, A034174, A006558, A083790, A052213, A052214, A175590, A218448, A218865.

Sequence in context: A129248 A204807 A257954 * A297848 A218110 A233485

Adjacent sequences: A218452 A218453 A218454 * A218456 A218457 A218458

Keyword

nonn

Author

M. F. Hasler, Oct 29 2012

Extensions

a(2)-a(20) from Donovan Johnson, Oct 29 2012

Status

approved