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A249896 a(n+1) is next smallest square not divisible by 10 beginning with a(n), initial term is 6. 4
6, 64, 64009, 6400960036, 640096003602877347904, 640096003602877347904912233550482787380625, 6400960036028773479049122335504827873806251020537411455326101704116338781035920283225 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..7.

PROG

(PARI) a(n)=k=n; s=1; while(s<5*10^7, if(s%10, if(s^2\(10^(#Str(s^2)-#Str(k)))==k, print1(s^2, ", "); k=s^2)); s++)

a(7)

(Python)

def f(x):

..print(x, end=', ')

..n = x

..s = 1

..while s < 10**7:

....if s % 10:

......S = str(s**2)

......if S.startswith(str(n)):

........print(s**2, end=', ')

........n = s**2

....s += 1

f(7)

CROSSREFS

Cf. A048559, A048561.

Sequence in context: A258425 A249592 A087488 * A249828 A179879 A297516

Adjacent sequences:  A249893 A249894 A249895 * A249897 A249898 A249899

KEYWORD

nonn,base,hard

AUTHOR

Derek Orr, Nov 08 2014

STATUS

approved

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Last modified January 17 15:12 EST 2020. Contains 330958 sequences. (Running on oeis4.)