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, 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