

A159254


Numbers n with property that n^2 ends with 49.


3



7, 43, 57, 93, 107, 143, 157, 193, 207, 243, 257, 293, 307, 343, 357, 393, 407, 443, 457, 493, 507, 543, 557, 593, 607, 643, 657, 693, 707, 743, 757, 793, 807, 843, 857, 893, 907, 943, 957, 993, 1007, 1043, 1057, 1093, 1107, 1143, 1157, 1193, 1207, 1243, 1257
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,1


COMMENTS

First 7 terms = 7th row in A111445.


LINKS

Table of n, a(n) for n=1..51.
Index entries for linear recurrences with constant coefficients, signature (1,1,1).


FORMULA

a(1)=7, a(2)=43, a(n)=50+a(n2).
From Colin Barker, Jul 04 2014: (Start)
a(n) = (11*(1)^n+50*n25)/2.
a(n) = a(n1)+a(n2)a(n3).
G.f.: x*(7*x^2+36*x+7) / ((x1)^2*(x+1)). (End)


PROG

(PARI) select(n>n^2%100==49, vector(10^3, n, n)) \\ Colin Barker, Jul 04 2014


CROSSREFS

A111445 Triangle read by rows: row n contains the first n numbers whose squares end in n^2.
Sequence in context: A175159 A173828 A045800 * A062336 A085704 A243459
Adjacent sequences: A159251 A159252 A159253 * A159255 A159256 A159257


KEYWORD

base,nonn,easy


AUTHOR

Zak Seidov, Apr 07 2009


STATUS

approved



