A034107 - OEIS

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A034107

Fractional part of square root of a(n) starts with 1: first term of runs.

1

10, 17, 27, 38, 51, 66, 83, 103, 124, 147, 172, 199, 229, 260, 293, 328, 365, 405, 446, 489, 534, 581, 631, 682, 735, 790, 847, 907, 968, 1031, 1096, 1163, 1233, 1304, 1377, 1452, 1529, 1609, 1690, 1773, 1858, 1945, 2035, 2126, 2219, 2314, 2411, 2511, 2612

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Table of n, a(n) for n=1..49.

PROG

(Python)

from math import isqrt

def a(n):

k = (n + 2)**2

while isqrt(100*k)%10 != 1: k += 1

return k

print([a(n) for n in range(1, 50)]) # Michael S. Branicky, Oct 17 2021, edited Jan 11 2026

CROSSREFS

Sequence in context: A188302 A190771 A034097 * A364823 A019991 A164285

Adjacent sequences: A034104 A034105 A034106 * A034108 A034109 A034110

KEYWORD

nonn,base

AUTHOR

Patrick De Geest, Sep 15 1998

EXTENSIONS

Offset 1 from Alois P. Heinz, Aug 05 2020

STATUS

approved