A200049 - OEIS

A200049

Positions of squares of odd primes among odd powerful numbers A062739.

2, 3, 5, 7, 9, 12, 14, 16, 20, 21, 27, 29, 30, 34, 37, 44, 45, 48, 52, 53, 58, 61, 65, 71, 75, 76, 78, 79, 84, 93, 97, 100, 101, 109, 111, 115, 119, 122, 128, 132, 133, 142, 144, 146, 147, 157, 165, 169, 170, 172, 178, 180, 188, 193, 198, 202, 203, 207, 211, 213, 221, 231, 233, 234, 238, 251, 254, 261, 263, 267, 271

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

OFFSET

1,1

LINKS

Zak Seidov, Table of n, a(n) for n = 1..1000

FORMULA

A062739(a(n)) = (A000040(n+1))^2.

PROG

(PARI) lista(nn) = select(x->(issquare(x) && isprime(sqrtint(x))), select(x->(ispowerful(x) && (x % 2)), vector(nn, k, k)), 1); \\ Michel Marcus, Jun 18 2017

CROSSREFS

Cf. A000040, A062739.

Sequence in context: A284914 A293262 A348623 * A279984 A184017 A024195

Adjacent sequences: A200046 A200047 A200048 * A200050 A200051 A200052

KEYWORD

nonn

AUTHOR

Zak Seidov, Nov 13 2011

STATUS

approved