A173494 - OEIS

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A173494

Numbers m such that no square greater than 1 can be written as sum of distinct divisors of m.

1

1, 2, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 38, 41, 43, 47, 53, 58, 59, 61, 65, 67, 71, 73, 74, 77, 79, 82, 83, 85, 86, 89, 91, 97, 101, 103, 106, 107, 109, 113, 127, 131, 133, 134, 137, 139, 145, 146, 149, 151, 157, 163, 167, 173, 178, 179, 181, 185, 187, 191, 193, 197

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OFFSET

1,2

COMMENTS

A173493(a(n)) = 1;

A045344 is a subsequence, the primes except 3;

2546 is the smallest term having more than two prime factors: 2546=2*19*67.

LINKS

Table of n, a(n) for n=1..62.

CROSSREFS

Sequence in context: A081259 A177512 A118751 * A137519 A045344 A087685

Adjacent sequences: A173491 A173492 A173493 * A173495 A173496 A173497

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Feb 20 2010

STATUS

approved